[SC] Character Relations!
Pretty much don't sweat the order these are in. The trolls are in hemospectrum order, Karkat's partner is first on the non-HS row, and everything after that is up in the air. I basically just add them as I think of them or as Karkat gets CR with them. Or as I find them on the taken list. :V GO TEAM ADORABLOODTHIRSTY.
This will always be under construction, for I am fat and lazy and what is this whole social thing even. If I haven't added your character and you'd like to know where they stand with Karkat, feel free to drop me a comment! No, really, I don't mind. Sometimes that's the push I need to put names on this list.
The charts were made by novelvision and stolen shamelessly by me because I cannot do it. I cannot HT the ML.
aradia megid0
Not gonna lie, she weirds him out. Back on Alternia he apparently doesn't remember/never knew her personality pre-death, and her "h0ll0w w0rds" creeped him out badly enough that he avoided talking to her. In Sgrub things weren't much better, except that on top of morose prophesies and her usual emotionlessness, she suddenly had a vicious temper. Now she's in Death City and apparently from a point in the future where she's been resurrected? Karkat has no idea what's going on, and Aradia herself hasn't been too forthcoming with the details.
Still, it's kind of nice to have her alive again. She's a lot easier to talk to now, and he'd sort of wanted to make her less dead anyway. Looks like everything worked out for once. Despite everything, he considers her a friend.
tAVROS nITRAM,
Ugh, this idiot. Karkat doesn't have much patience for Tavros's constant stammering and complete lack of anything resembling a spine. He was a wishy-washy dumbass on Alternia, he basically slept through Sgrub, and here in Death City he's only recently stopped avoiding partnerships and combat like the plague. It's frustrating, and Karkat isn't sure if he should be relieved he's finally making some effort to defend himself or headdesk forever because the boy honestly thinks he can beat Vriska. The only real redeeming feature of this friendship is that Tavros seem to be constantly getting himself into the most hilarious interesting romantic trouble.
2ollux captor
Best friends, or at least they usually are. Karkat's temper and Sollux's moody personality clash constantly, and they've developed a pattern of bickering, swearing, insulting each other, and then Karkat melodramatically writes Sollux off only to return like a minute later and take it all back. But it's cool; they're both pretty comfortable with the friendly hostility thing. And Karkat at least knows he can trust Sollux, which is a pretty big deal to him.
:33 > nepeta leijon!
She's a nice enough girl, really, and she's usually eager to follow orders and do her part, which puts her in one of the top spots as far as Karkat's troll friends go. Unfortunately, nobody's perfect, and Karkat really hates her insistence on roleplaying as her lusus all the time. It's so annoying, roleplay is annoying, who even fucking does that.
There's also the matter of her crush on him, which she confessed to shortly after the events on Halloween. He hated it, and in his clumsy way he tried to let her down easy, but he still rejected her. Feels terrible, man. He's been lying low since then, giving her some time to get past it.
Kanaya Maryam (♦)
Since entering Death City they've become moirails, and he absolutely trusts Kanaya's judgment as far as things that aren't Vriska are concerned. She's calm, she's rational, and he has a hard time getting and staying angry at her. And she also has rare blood, even though hers is much better than his, so they sort of understand each other on that level too.
T3R3Z1 PYROP3 (♥)
Let's just put this out on the table where everyone can see it: Karkat's all about Terezi. She was the first to find out about his blood and accept him in spite of (because of?) it, not to mention the fact that she's incredibly smart and manipulative. Though she's as violent as most higher-blooded trolls, her violence always serves a purpose and her victims deserve it. He can respect that.
Things between them finally came to a head after a heated argument about Strider that neither of them wanted. They're dating on whatever official basis means that Karkat doesn't have to admit there's any sort of special feelings there.
Vriiiiiiiiska Serk8
SUCH a huge bitch. She has her uses as a manipulative little highblood and potential meat shield, but Karkat really does hate her. He hates her for how ridiculously she picks on Tavros, he hates her for blinding Terezi, and in Death City he completely fucking hates her for pretty much everything she's done so far. She's a psychopath in his eyes, and he's glad she spent all that time in jail.
D --> Equius Zahhak
Blue blood scum, as far as Karkat's concerned. These two just... don't see eye to eye at all. Equius's arrogance and uptight traditional beliefs piss Karkat off, Karkat's foul language and disrespect for the way things have always been enrage Equius, and it's just a big mess. The only thing Karkat doesn't hate about him is that getting orders from lowbloods excites Equius enough that he usually follows them. Unfortunately, Karkat also hates people getting off on his orders, so we're right back at square one.
GaMzEe MoThErFuCkIn MaKaRa
For some infuriating reason, Gamzee calls Karkat his best friend. God, why the hell does Karkat have to fall down all this friendship with idiots? Though it doesn't always show, Karkat cares about the space case and tends to keep an eye on him. He swears and insults Gamzee in the process, but he's still there for a brother.
As a side note, he knows Gamzee can be extremely dangerous, but he doesn't know what how bad things will get if the clown goes blind stinking sober.
eridan ampora
wwho cares
F-EF-ERI P-EIX-ES! 38D
They end up talking fairly frequently since Karkat always seems to be in the middle of something exciting, and also because she spends so much time around his best friend, but he seems to be neutral toward Feferi. He treats her about the same as he treats the other trolls, language and rude gestures and all, and whenever she starts glubbing about feelings or sea life or whatever completely pointless thing is making her spaz this time around, he makes it pretty clear he doesn't give a fuck.
dave strider
Surprise! They don't get along. Dave showed up in Death City pre-annoyed with Karkat's canon shenanigans, and Karkat had no idea who this fucker was or why he was being antagonized by him. It doesn't help that Dave made a comic insulting him and constantly flirts around with Terezi, either. Hate. Hatey hate hate.
Platonically.
jade harley!!! :)
Jade made the mistake of telling Karkat that he'd be trolling her mercilessly in his future, so he went ahead and assumed she deserved it and got himself a head start on harassing her here. It was short-lived, however. An argument turned into a dare turned into him teaching her how to cook something simple, and recently the two of them ended up in accidental cahoots against Dave. He guesses she's not terrible, at least she learns and she listens and she isn't a massive bag of douche over whatever he hasn't done yet because he's still not Future Karkat.
john egbert
Poor Karkat has no idea what their relationship will become in the future. He was taken from pre-blackrom, so all he knows is that there's this kid and he's happy and friendly and already knows his name and oh boy they are buddies!!! Which REALLY pissed Karkat off, and for the longest time he fought it.
He's come around recently, admitting that maybe they're friends. John made Karkat soup while he was sick and they have movies in common, so maybe the kid's not so bad after all. Still kind of an idiot, though.
Rose Lalonde
She likes to twist his words and analyze his rants, which reeeeaaaally puts him on edge. Sure, she's 13 like him, but she has some kind of weird brain doctor thing she does, and who knows what she's observing and interpreting? He dislikes that, he dislike HER, and he tries to avoid having anything to do with her.
Wayward Vagabond
WV has gone back searching for his path on blighted, ruined Earth. Karkat is still annoyed that he never found out just what the hell brought a seemingly random Dersite to Death City.
Jack Noir Spades Slick
This is one hell of a weird relationship, but let me see if I can elaborate a bit on Karkat's end at least. Back when Spades Slick still went by the name Jack, a weird series of events led to him and Karkat becoming allies. Karkat was stunned to see Jack had the same horrid red blood as him and the two became blood brothers, in a way.
Slick isn't a very nice guy, and even though he was on Karkat's side he still stabbed the kid a few times. And since he had Karkat's loyalty, Karkat actually defended him. Despite all common sense, Karkat looks up to Slick and respects him a lot, and being in a city full of creatures that all bleed the same hasn't cheapened their bond in his weird yellow eyes.
Dad Egbert
Placeholder text! Karkat met him, and he was okay for a boring old guy, but he had no idea who he was.
Bro Strider
Placeholder text! Pretty sure Karkat's gonna continue hating on Striders though. here thar be non-hamsteaks
Executor Selendis
Selendis sort of became Karkat's Meister partner by mistake. A few coincidental meetings led to him helping her learn resonation, which proved to them that they could resonate, and when he needed a Meister's help during an emergency he turned to her. After that, they just sort of understood that they were partnered, and as different as they are, they work well together. Both are driven, both like to fight and are pretty good at it, and both want to get this war over with so they can get back to business in their own worlds. They have their clashes, like when Karkat taught one of his typical gross phrases to another Protoss in the city, but for the most part they're a scarily good team.
John Watson
Watson's one of the reasonable ones. They're not friends or anything, but at least Watson treats him with respect. And he DID apologize for blowing Karkat off when he warned him about dueling Eridan.
Kida Masaomi
Kida is gone now, but he was the first human Karkat had any sort of meaningful contact with, and terrifying as it sounds, Kida shaped a lot of Karkat's views on the species. They weren't really close, but they had some pretty fascinating discussions about romance.
The Cheshire Cat
Cheshire is adept at trolling Karkat, which Karkat loves just as much as you'd expect. At first he just figured the cat was annoying and insane, but ever since Cheshire partnered with Vriska he's come to appreciate how incredibly dangerous he can be. Karkat tries to avoid Cheshire, but Cheshire often seeks him out.
Elizabeta Hedevary (Hungary)
But mooooom, Karkat isn't a little kid! He's also your boss! >:C
Elizabeta is something of a Team Mom on the Watch, and even though Karkat is one of her Zone Leaders, she looks after him too. Especially after his collapse following the events on Halloween. He grumbles and bitches and totally acts like he resents it, but she's nice to him so he can't be all that mad at her.
Gilbert Weillschmidt (Prussia)
DFGKHLDJFHLKHLS STUPID PRUSSIA. KARKAT DOESN'T WANT YOUR CITIZENSHIP OR YOUR FUCKING CAKE. STOP CALLING HIM CITIZEN AND STOP POKING HIS POSTS.
Ludwig (Germany)
Germany was the Weapon who helped Karkat figure out how to transform when he first arrived. He was probably the only one with the saint-like patience to do it without kicking the kid down the stairs in the process, too.
Matthew Williams (Canada)
Karkat only spoke to Canada a couple of times. He was helpful, explaining who Adachi was and why it was so bad that he was kidnapped, and Karkat hasn't forgotten that. Good to know where your sources of information are! He's also so bad at dating it's kind of sad, but Karkat totally knows what sort of advice to give him, so there's always that.
Sadiq Adnan (Turkey)
They haven't spoken much, if at all. Turkey was one of the people who responded when he reported Kanaya missing, he's the one who found her and brought her back to the city, and basically he's close enough to her that Karkat tends to notice him.
Claire Stanfield
CALL HIM SPACE BOY AGAIN AND HE WILL RIP OUT YOUR STILL-BEATING HUMAN HEART WITH A SPOON AND EAT IT WHILE YOU WATCH GDI
Karkat met Claire moments after the latter's arrival in Death City and took an instant dislike to him. Claire doesn't take him seriously at all and is really annoying on top of that. The dude himself seems to think they're friends now, which frankly does nothing to help.
Vergil Sparda
Nothing major here. Vergil is one of the Watch members working under Karkat, at least on a temporary basis.
Rei Kurosawa
Karkat's seen her around, but his first real opinion of her came when she popped up on the network showing off her topless Halloween costume. They've spoken a few times since, and she seems okay enough, but this weird priestess curse of hers still sounds like something from one of Tavros' shitty kiddie books. Also, somehow he seems to have become a member of Rei's infamous shota army. I don't even.
Faris Scherwiz
Gone now. When she was in Death City Karkat already disliked her for being a pirate, made worse when she tried to get money from him in exchange for helping him find Kanaya. You just can't trust those swashbuckling types.
Auron
Another one of the Watch members who answers to a bossy troll kid! Karkat actually gets along fairly well with Auron. He's always been a sucker for a badass with a blade, and Auron taught him a few things when they sparred. Not to mention the fact that Auron either recognizes and respects Karkat's leadership or at least quietly goes along with it in his stoic swordsmanly way.
Rikku
She's annoying and perky and so damn loud, and she has a tendency to lapse into her mother language. Karkat thinks she's annoying and tries to avoid her, but she's John's partner so it's not always easy.
Leo
Leo is a Half, some sort of part-animal genetic reject from his world, a second-class citizen with a lot of bitterness. As such, he pings Karkat a lot more strongly than the troll would like to admit. Leo also apparently has some sort of sickness, a weird madness that Karkat doesn't fully understand. He's been trying to ignore it and avoid Leo since they ran into each other on the 7th.
Alex Louis Armstrong
Karkat is another victim of Armstrong's sudden and frequent shirt removal + sparkle combos. This guy isn't serious, right?
Roy Mustang
The big cheese on the Watch, and Karkat's boss. First impressions weren't favorable -- Roy set up a stunt in which he hired "thieves" to take small items off a few people as an exercise for his men -- and Karkat joined the Watch reluctantly at Selendis' request, almost entirely because he found out partners got leadership positions.
Otherwise, Karkat gets along okay with Roy. Roy gave him a good job despite his age and personality, he treats him with respect, and when Karkat demanded to be in on Shibusen's decision after Vriska nearly killed Kurt, Roy supported his claim.
Zura Katsura Kotarou
They mainly know each other because Katsura is a Cancer, and although Karkat doesn't collect his crabby star children like some trolls, he does tend to notice who they are. Every time they speak Karkat is left wondering if Katsura is pulling everyone's leg. How can somebody make perfect sense and then suddenly come up with such surreal shit it's hard to tell if they're even from this planet?
Kurt Hummel
Bluh, Kurt is annoying. Mainly the two know each other because of the other trolls. Kurt got caught up in some drama between Vriska and Kanaya and was badly hurt for his trouble, and later on Tavros went to Karkat for advice on his sudden crush on Kurt. They bantered once, which was admittedly kind of fun, but mostly Karkat avoids the shrieky little drama queen.
Lauren Zizes
Karkat only met her once, but once was enough. She's argumentative and stubborn and insulting and just ARGH.
Alice Liddell
Karkat made the mistake of telling Alice that he lives in a hive, and ever since then she's been insisting that he's actually a bee. She just does it to bother him, but holy shit does it work! He fucking HATES being mistaken for a bee.
Shizuo Heiwajima
One of the funniest things (from his perspective) that Karkat's done on Death City was tell Shizuo that as an Aquarius, his patron troll is Eridan. Shizuo fucking HATES Eridan. You simply can't BUY entertainment like his reaction.
Kurapika
wordswordswords.
Kuroro Lucifer
wordswordswords.
Joan of Arc
Nothing major here. Karkat's not particularly religious and she kind of... is, so they spoke once briefly about Catholicism and that was about it.
Keisuke Nago
This jerk was no help at all when Karkat was getting his horns handed to him by Terezi. All he did was politely request that he refrain from swearing on the network. Way to help a troll out, bro!
Aqua
She decided to ask him of all people for typing lessons, so he taught her where the home keys are and mercifully refrained from showing her the capslock. No, that isn't an awkward sexual metaphor, this really happened. Also she ended up on Nepeta's shipping wall with Jade, which is frankly hilarious.
Grell Sutcliff
Every time this douchebag posts on the netword, Karkat understands him a little less. Seriously, how is an army of sexy men supposed to win the war? What the fuck, Grell.
Saralegui
This guy is so annoying! He keeps responding to Karkat's posts, apparently for no particular reason than the fact that he's bored or wants to bother him or something. He also seems to have legitimately befriended Eridan, which baffles Karkat.
Adrian Monk
On one hand, this guy has a serious mental condition of some sort and Karkat would never admit to how bad he feels for the poor bastard. War is no place for people like him. On the other, Monk is a sandwich-destroying ASSHOLE who doesn't know when to keep his grubsucking PRONGS TO HIMSELF and fucking seriously, can't a guy just have lunch in peace?!
Fluttershy
Karkat does not intend to talk to Fluttershy. Ever. But her posts are totally worth checking out for Equius' reactions alone, not to mention the fact that Gamzee has been teaching her... words. And Sollux is encouraging this. Guys, seriously, this is why you're his friends.
Maito Gai
Gai has apparently decided to make Karkat his new personal project! He has been pestering Karkat since the first angry grey post hit the network, giving him typical Gai advice and encouragement, and Karkat continues to fume and tsun and insult and WILL YOU NOT JUST GIVE UP ALREADY HE DOESN'T WANT TO HEAR IT YOU'RE NOT HIS LUSUS LA LA LA NOT LISTENING!!! Also Karkat really hates how well Gai sees through his defense mechanisms and has been trying to keep the serious conversations to a minimum.
But when he was at his worst and Terezi was badly hurt, Gai's the one who sat with him and helped him realize that it wasn't his fault and that he needed to get back up and be the leader. He's grateful for that, even if he doesn't want to say so.
Naruto Uzumaki
No but seriously, NINJAS DO NOT WEAR ORANGE, DUMBASS.>:C
Naruto has decided that he and Karkat are friends after a couple of arguments, and Karkat is all like what the hell, I didn't agree to this!
Rock Lee
As someone already pointed out, asking for love advice on the network is basically like shining the crab signal into the sky. Rock (Lee?) asked some questions on behalf of a friend, and without knowing it was about Gai Karkat had a nice little conversation with him about romance.
Fuuka Yamagishi
Not such a bad person, really. Kind of a derp, but at least she's quiet and not bothersome. When she reappeared in Death City, Karkat was the one who did her soul scan.
Shinjiro Aragaki
Kanaya's partner and one sick fuck! Karkat didn't have much of an opinion of him besides a vaguely favorable once since he was chosen by Kanaya, but then Shinjiro just had to post on the network. With a bucket. Full of live crabs. THAT HE THEN DUMPED INTO BOILING WATER WHEN HE REALIZED HOW OFFENDED KARKAT WAS. He's seriously not going to get over this anytime soon.
Souji Seta
One of the many, many people in Death City who has had to sit through the troll romance lecture. Luckily, he didn't seem to mind and even asked some interesting questions! But he's also kind of annoying, pushing his nose into troll business, so Karkat is a little wary of him. Like seriously, why do you care so much, asshole?
Yosuke Hanamura
Another one of those pesky Cancers! And holy shit is this guy a pain. He has this Karkat impression he does that he thinks is hilarious, but somehow I don't think his crabby stardad appreciates the joke.
This will always be under construction, for I am fat and lazy and what is this whole social thing even. If I haven't added your character and you'd like to know where they stand with Karkat, feel free to drop me a comment! No, really, I don't mind. Sometimes that's the push I need to put names on this list.
The charts were made by novelvision and stolen shamelessly by me because I cannot do it. I cannot HT the ML.
aradia megid0
Not gonna lie, she weirds him out. Back on Alternia he apparently doesn't remember/never knew her personality pre-death, and her "h0ll0w w0rds" creeped him out badly enough that he avoided talking to her. In Sgrub things weren't much better, except that on top of morose prophesies and her usual emotionlessness, she suddenly had a vicious temper. Now she's in Death City and apparently from a point in the future where she's been resurrected? Karkat has no idea what's going on, and Aradia herself hasn't been too forthcoming with the details.
Still, it's kind of nice to have her alive again. She's a lot easier to talk to now, and he'd sort of wanted to make her less dead anyway. Looks like everything worked out for once. Despite everything, he considers her a friend.
tAVROS nITRAM,
Ugh, this idiot. Karkat doesn't have much patience for Tavros's constant stammering and complete lack of anything resembling a spine. He was a wishy-washy dumbass on Alternia, he basically slept through Sgrub, and here in Death City he's only recently stopped avoiding partnerships and combat like the plague. It's frustrating, and Karkat isn't sure if he should be relieved he's finally making some effort to defend himself or headdesk forever because the boy honestly thinks he can beat Vriska. The only real redeeming feature of this friendship is that Tavros seem to be constantly getting himself into the most hilarious interesting romantic trouble.
2ollux captor
Best friends, or at least they usually are. Karkat's temper and Sollux's moody personality clash constantly, and they've developed a pattern of bickering, swearing, insulting each other, and then Karkat melodramatically writes Sollux off only to return like a minute later and take it all back. But it's cool; they're both pretty comfortable with the friendly hostility thing. And Karkat at least knows he can trust Sollux, which is a pretty big deal to him.
:33 > nepeta leijon!
She's a nice enough girl, really, and she's usually eager to follow orders and do her part, which puts her in one of the top spots as far as Karkat's troll friends go. Unfortunately, nobody's perfect, and Karkat really hates her insistence on roleplaying as her lusus all the time. It's so annoying, roleplay is annoying, who even fucking does that.
There's also the matter of her crush on him, which she confessed to shortly after the events on Halloween. He hated it, and in his clumsy way he tried to let her down easy, but he still rejected her. Feels terrible, man. He's been lying low since then, giving her some time to get past it.
Kanaya Maryam (♦)
Since entering Death City they've become moirails, and he absolutely trusts Kanaya's judgment as far as things that aren't Vriska are concerned. She's calm, she's rational, and he has a hard time getting and staying angry at her. And she also has rare blood, even though hers is much better than his, so they sort of understand each other on that level too.
T3R3Z1 PYROP3 (♥)
Let's just put this out on the table where everyone can see it: Karkat's all about Terezi. She was the first to find out about his blood and accept him in spite of (because of?) it, not to mention the fact that she's incredibly smart and manipulative. Though she's as violent as most higher-blooded trolls, her violence always serves a purpose and her victims deserve it. He can respect that.
Things between them finally came to a head after a heated argument about Strider that neither of them wanted. They're dating on whatever official basis means that Karkat doesn't have to admit there's any sort of special feelings there.
Vriiiiiiiiska Serk8
SUCH a huge bitch. She has her uses as a manipulative little highblood and potential meat shield, but Karkat really does hate her. He hates her for how ridiculously she picks on Tavros, he hates her for blinding Terezi, and in Death City he completely fucking hates her for pretty much everything she's done so far. She's a psychopath in his eyes, and he's glad she spent all that time in jail.
D --> Equius Zahhak
Blue blood scum, as far as Karkat's concerned. These two just... don't see eye to eye at all. Equius's arrogance and uptight traditional beliefs piss Karkat off, Karkat's foul language and disrespect for the way things have always been enrage Equius, and it's just a big mess. The only thing Karkat doesn't hate about him is that getting orders from lowbloods excites Equius enough that he usually follows them. Unfortunately, Karkat also hates people getting off on his orders, so we're right back at square one.
GaMzEe MoThErFuCkIn MaKaRa
For some infuriating reason, Gamzee calls Karkat his best friend. God, why the hell does Karkat have to fall down all this friendship with idiots? Though it doesn't always show, Karkat cares about the space case and tends to keep an eye on him. He swears and insults Gamzee in the process, but he's still there for a brother.
As a side note, he knows Gamzee can be extremely dangerous, but he doesn't know what how bad things will get if the clown goes blind stinking sober.
eridan ampora
wwho cares
F-EF-ERI P-EIX-ES! 38D
They end up talking fairly frequently since Karkat always seems to be in the middle of something exciting, and also because she spends so much time around his best friend, but he seems to be neutral toward Feferi. He treats her about the same as he treats the other trolls, language and rude gestures and all, and whenever she starts glubbing about feelings or sea life or whatever completely pointless thing is making her spaz this time around, he makes it pretty clear he doesn't give a fuck.
dave strider
Surprise! They don't get along. Dave showed up in Death City pre-annoyed with Karkat's canon shenanigans, and Karkat had no idea who this fucker was or why he was being antagonized by him. It doesn't help that Dave made a comic insulting him and constantly flirts around with Terezi, either. Hate. Hatey hate hate.
Platonically.
jade harley!!! :)
Jade made the mistake of telling Karkat that he'd be trolling her mercilessly in his future, so he went ahead and assumed she deserved it and got himself a head start on harassing her here. It was short-lived, however. An argument turned into a dare turned into him teaching her how to cook something simple, and recently the two of them ended up in accidental cahoots against Dave. He guesses she's not terrible, at least she learns and she listens and she isn't a massive bag of douche over whatever he hasn't done yet because he's still not Future Karkat.
john egbert
Poor Karkat has no idea what their relationship will become in the future. He was taken from pre-blackrom, so all he knows is that there's this kid and he's happy and friendly and already knows his name and oh boy they are buddies!!! Which REALLY pissed Karkat off, and for the longest time he fought it.
He's come around recently, admitting that maybe they're friends. John made Karkat soup while he was sick and they have movies in common, so maybe the kid's not so bad after all. Still kind of an idiot, though.
Rose Lalonde
She likes to twist his words and analyze his rants, which reeeeaaaally puts him on edge. Sure, she's 13 like him, but she has some kind of weird brain doctor thing she does, and who knows what she's observing and interpreting? He dislikes that, he dislike HER, and he tries to avoid having anything to do with her.
Wayward Vagabond
WV has gone back searching for his path on blighted, ruined Earth. Karkat is still annoyed that he never found out just what the hell brought a seemingly random Dersite to Death City.
Jack Noir Spades Slick
This is one hell of a weird relationship, but let me see if I can elaborate a bit on Karkat's end at least. Back when Spades Slick still went by the name Jack, a weird series of events led to him and Karkat becoming allies. Karkat was stunned to see Jack had the same horrid red blood as him and the two became blood brothers, in a way.
Slick isn't a very nice guy, and even though he was on Karkat's side he still stabbed the kid a few times. And since he had Karkat's loyalty, Karkat actually defended him. Despite all common sense, Karkat looks up to Slick and respects him a lot, and being in a city full of creatures that all bleed the same hasn't cheapened their bond in his weird yellow eyes.
Dad Egbert
Placeholder text! Karkat met him, and he was okay for a boring old guy, but he had no idea who he was.
Bro Strider
Placeholder text! Pretty sure Karkat's gonna continue hating on Striders though. here thar be non-hamsteaks
Executor Selendis
Selendis sort of became Karkat's Meister partner by mistake. A few coincidental meetings led to him helping her learn resonation, which proved to them that they could resonate, and when he needed a Meister's help during an emergency he turned to her. After that, they just sort of understood that they were partnered, and as different as they are, they work well together. Both are driven, both like to fight and are pretty good at it, and both want to get this war over with so they can get back to business in their own worlds. They have their clashes, like when Karkat taught one of his typical gross phrases to another Protoss in the city, but for the most part they're a scarily good team.
John Watson
Watson's one of the reasonable ones. They're not friends or anything, but at least Watson treats him with respect. And he DID apologize for blowing Karkat off when he warned him about dueling Eridan.
Kida Masaomi
Kida is gone now, but he was the first human Karkat had any sort of meaningful contact with, and terrifying as it sounds, Kida shaped a lot of Karkat's views on the species. They weren't really close, but they had some pretty fascinating discussions about romance.
The Cheshire Cat
Cheshire is adept at trolling Karkat, which Karkat loves just as much as you'd expect. At first he just figured the cat was annoying and insane, but ever since Cheshire partnered with Vriska he's come to appreciate how incredibly dangerous he can be. Karkat tries to avoid Cheshire, but Cheshire often seeks him out.
Elizabeta Hedevary (Hungary)
But mooooom, Karkat isn't a little kid! He's also your boss! >:C
Elizabeta is something of a Team Mom on the Watch, and even though Karkat is one of her Zone Leaders, she looks after him too. Especially after his collapse following the events on Halloween. He grumbles and bitches and totally acts like he resents it, but she's nice to him so he can't be all that mad at her.
Gilbert Weillschmidt (Prussia)
DFGKHLDJFHLKHLS STUPID PRUSSIA. KARKAT DOESN'T WANT YOUR CITIZENSHIP OR YOUR FUCKING CAKE. STOP CALLING HIM CITIZEN AND STOP POKING HIS POSTS.
Ludwig (Germany)
Germany was the Weapon who helped Karkat figure out how to transform when he first arrived. He was probably the only one with the saint-like patience to do it without kicking the kid down the stairs in the process, too.
Matthew Williams (Canada)
Karkat only spoke to Canada a couple of times. He was helpful, explaining who Adachi was and why it was so bad that he was kidnapped, and Karkat hasn't forgotten that. Good to know where your sources of information are! He's also so bad at dating it's kind of sad, but Karkat totally knows what sort of advice to give him, so there's always that.
Sadiq Adnan (Turkey)
They haven't spoken much, if at all. Turkey was one of the people who responded when he reported Kanaya missing, he's the one who found her and brought her back to the city, and basically he's close enough to her that Karkat tends to notice him.
Claire Stanfield
CALL HIM SPACE BOY AGAIN AND HE WILL RIP OUT YOUR STILL-BEATING HUMAN HEART WITH A SPOON AND EAT IT WHILE YOU WATCH GDI
Karkat met Claire moments after the latter's arrival in Death City and took an instant dislike to him. Claire doesn't take him seriously at all and is really annoying on top of that. The dude himself seems to think they're friends now, which frankly does nothing to help.
Vergil Sparda
Nothing major here. Vergil is one of the Watch members working under Karkat, at least on a temporary basis.
Rei Kurosawa
Karkat's seen her around, but his first real opinion of her came when she popped up on the network showing off her topless Halloween costume. They've spoken a few times since, and she seems okay enough, but this weird priestess curse of hers still sounds like something from one of Tavros' shitty kiddie books. Also, somehow he seems to have become a member of Rei's infamous shota army. I don't even.
Faris Scherwiz
Gone now. When she was in Death City Karkat already disliked her for being a pirate, made worse when she tried to get money from him in exchange for helping him find Kanaya. You just can't trust those swashbuckling types.
Auron
Another one of the Watch members who answers to a bossy troll kid! Karkat actually gets along fairly well with Auron. He's always been a sucker for a badass with a blade, and Auron taught him a few things when they sparred. Not to mention the fact that Auron either recognizes and respects Karkat's leadership or at least quietly goes along with it in his stoic swordsmanly way.
Rikku
She's annoying and perky and so damn loud, and she has a tendency to lapse into her mother language. Karkat thinks she's annoying and tries to avoid her, but she's John's partner so it's not always easy.
Leo
Leo is a Half, some sort of part-animal genetic reject from his world, a second-class citizen with a lot of bitterness. As such, he pings Karkat a lot more strongly than the troll would like to admit. Leo also apparently has some sort of sickness, a weird madness that Karkat doesn't fully understand. He's been trying to ignore it and avoid Leo since they ran into each other on the 7th.
Alex Louis Armstrong
Karkat is another victim of Armstrong's sudden and frequent shirt removal + sparkle combos. This guy isn't serious, right?
Roy Mustang
The big cheese on the Watch, and Karkat's boss. First impressions weren't favorable -- Roy set up a stunt in which he hired "thieves" to take small items off a few people as an exercise for his men -- and Karkat joined the Watch reluctantly at Selendis' request, almost entirely because he found out partners got leadership positions.
Otherwise, Karkat gets along okay with Roy. Roy gave him a good job despite his age and personality, he treats him with respect, and when Karkat demanded to be in on Shibusen's decision after Vriska nearly killed Kurt, Roy supported his claim.
Zura Katsura Kotarou
They mainly know each other because Katsura is a Cancer, and although Karkat doesn't collect his crabby star children like some trolls, he does tend to notice who they are. Every time they speak Karkat is left wondering if Katsura is pulling everyone's leg. How can somebody make perfect sense and then suddenly come up with such surreal shit it's hard to tell if they're even from this planet?
Kurt Hummel
Bluh, Kurt is annoying. Mainly the two know each other because of the other trolls. Kurt got caught up in some drama between Vriska and Kanaya and was badly hurt for his trouble, and later on Tavros went to Karkat for advice on his sudden crush on Kurt. They bantered once, which was admittedly kind of fun, but mostly Karkat avoids the shrieky little drama queen.
Lauren Zizes
Karkat only met her once, but once was enough. She's argumentative and stubborn and insulting and just ARGH.
Alice Liddell
Karkat made the mistake of telling Alice that he lives in a hive, and ever since then she's been insisting that he's actually a bee. She just does it to bother him, but holy shit does it work! He fucking HATES being mistaken for a bee.
Shizuo Heiwajima
One of the funniest things (from his perspective) that Karkat's done on Death City was tell Shizuo that as an Aquarius, his patron troll is Eridan. Shizuo fucking HATES Eridan. You simply can't BUY entertainment like his reaction.
Kurapika
wordswordswords.
Kuroro Lucifer
wordswordswords.
Joan of Arc
Nothing major here. Karkat's not particularly religious and she kind of... is, so they spoke once briefly about Catholicism and that was about it.
Keisuke Nago
This jerk was no help at all when Karkat was getting his horns handed to him by Terezi. All he did was politely request that he refrain from swearing on the network. Way to help a troll out, bro!
Aqua
She decided to ask him of all people for typing lessons, so he taught her where the home keys are and mercifully refrained from showing her the capslock. No, that isn't an awkward sexual metaphor, this really happened. Also she ended up on Nepeta's shipping wall with Jade, which is frankly hilarious.
Grell Sutcliff
Every time this douchebag posts on the netword, Karkat understands him a little less. Seriously, how is an army of sexy men supposed to win the war? What the fuck, Grell.
Saralegui
This guy is so annoying! He keeps responding to Karkat's posts, apparently for no particular reason than the fact that he's bored or wants to bother him or something. He also seems to have legitimately befriended Eridan, which baffles Karkat.
Adrian Monk
On one hand, this guy has a serious mental condition of some sort and Karkat would never admit to how bad he feels for the poor bastard. War is no place for people like him. On the other, Monk is a sandwich-destroying ASSHOLE who doesn't know when to keep his grubsucking PRONGS TO HIMSELF and fucking seriously, can't a guy just have lunch in peace?!
Fluttershy
Karkat does not intend to talk to Fluttershy. Ever. But her posts are totally worth checking out for Equius' reactions alone, not to mention the fact that Gamzee has been teaching her... words. And Sollux is encouraging this. Guys, seriously, this is why you're his friends.
Maito Gai
Gai has apparently decided to make Karkat his new personal project! He has been pestering Karkat since the first angry grey post hit the network, giving him typical Gai advice and encouragement, and Karkat continues to fume and tsun and insult and WILL YOU NOT JUST GIVE UP ALREADY HE DOESN'T WANT TO HEAR IT YOU'RE NOT HIS LUSUS LA LA LA NOT LISTENING!!! Also Karkat really hates how well Gai sees through his defense mechanisms and has been trying to keep the serious conversations to a minimum.
But when he was at his worst and Terezi was badly hurt, Gai's the one who sat with him and helped him realize that it wasn't his fault and that he needed to get back up and be the leader. He's grateful for that, even if he doesn't want to say so.
Naruto Uzumaki
No but seriously, NINJAS DO NOT WEAR ORANGE, DUMBASS.>:C
Naruto has decided that he and Karkat are friends after a couple of arguments, and Karkat is all like what the hell, I didn't agree to this!
Rock Lee
As someone already pointed out, asking for love advice on the network is basically like shining the crab signal into the sky. Rock (Lee?) asked some questions on behalf of a friend, and without knowing it was about Gai Karkat had a nice little conversation with him about romance.
Fuuka Yamagishi
Not such a bad person, really. Kind of a derp, but at least she's quiet and not bothersome. When she reappeared in Death City, Karkat was the one who did her soul scan.
Shinjiro Aragaki
Kanaya's partner and one sick fuck! Karkat didn't have much of an opinion of him besides a vaguely favorable once since he was chosen by Kanaya, but then Shinjiro just had to post on the network. With a bucket. Full of live crabs. THAT HE THEN DUMPED INTO BOILING WATER WHEN HE REALIZED HOW OFFENDED KARKAT WAS. He's seriously not going to get over this anytime soon.
Souji Seta
One of the many, many people in Death City who has had to sit through the troll romance lecture. Luckily, he didn't seem to mind and even asked some interesting questions! But he's also kind of annoying, pushing his nose into troll business, so Karkat is a little wary of him. Like seriously, why do you care so much, asshole?
Yosuke Hanamura
Another one of those pesky Cancers! And holy shit is this guy a pain. He has this Karkat impression he does that he thinks is hilarious, but somehow I don't think his crabby stardad appreciates the joke.