Depressing headcanon tiem is go.
1. Before the massacre, Sasuke didn't dislike sweets as much; Itachi would (very very very) rarely take him out to go eat dango/go to a sweets shop before they headed back home, and even though he didn't have Itachi's hilarious sweet tooth he loved the time spent with him enough that he didn't mind eating them. After the massacre, it just brought back memories and so he made a point to not eat them. And by now it's been enough years that anything even remotely sugary tastes weird and gross to him. Just. Ew.
2. Sasuke is a clean, methodical person. This isn't really naturally inborn into him-- he was never on Naruto's level of messiness, but like any kid he never really liked to clean and just did it when his mom told him to pick up his room or something. After the massacre, Sasuke started to clean things out of guilt. He'd think "Mom would have been disappointed", and "Dad liked things neat", and he would just pick up everything and clean it. He's borderline OCD about it.
3. Continuing on that note, Sasuke had no idea how to clean most things, or the best way to keep certain food for longer, or even how to cook more than rice. He went through a lot of trial and error. Sometimes he'd overhear housewives giving each other tricks to get blood out, or how to dissolve grass stains, stuff like that. The grocer liked him enough that she'd tell him things like which cut of meat was best for blablabla, how to best keep the tomatoes he likes so much-- etc. For cooking-- well, his mom never wrote down the recipes she used to cook, so he bought a recipe book and tried to remember what she cooked.
4. For the first year after the massacre, every time he failed to get things that weren't ninja-related right the first time-- so still on the cleaning, laundry, cooking note-- he'd grow incredibly frustrated with himself. He'd never yell, but he'd break things and throw things and just sit in a ball on the floor, apologizing repeatedly.
5. Because of all this, Sasuke's pretty good housewife material. Not that he'd admit it. :| Learning to sew was easier for him, mundane-skills wise. Mostly because if he wanted shirts with the Uchiha fan on them, he had to either sew it on himself or go pillage the dead's closets. He took the former option.
6. Sasuke spent most of his free time training, so the other stuff was done when he had no choice. He'd come back late, try to fix something for him to eat, clean up, and pass out in bed. It was unhealthy, but it's how he managed to not have nightmares the first year. He learned to pace himself over the years, mostly because when you're exhausted you don't grow stronger and that sucks.
7. Sasuke moved to an apartment in the village grounds after the massacre, though because of who he was, he got a big one, of course. His room looks almost identical to the one he had when he was young, only he has a patio door-- that's because Sasuke made sure everything looked the same. And even though he has a tv he never actually watches... whatever things one can watch on the TVs in ninja village. It's just there because he had one as a kid, too.
8. The pillows make it easier to pass out and were the only form of comfort he allowed himself as a kid. He wasn't a kid anymore he was ~an avenger~, so he didn't keep his toys. Instead he'd hold a pillow and tell himself it didn't count.
9. Sasuke usually celebrated his birthday by training until he passed out. Partly to forget it's his birthday and the stuff he misses from that, and partly because it's one more year he hasn't managed to avenge his family.
10. When his family was alive, they visited Grandma Cat (why... is that her actual name) pretty much monthly. They didn't always bring the kids, but Sasuke saw her enough that he really was used to Denka and Hina. He mostly learned ALL ABOUT CATS during these visits, though basics on how to buy weaponry also happened. But yeah, he's pretty much a cat expert. He likes them better than dogs, usually.
11. SPEAKING OF DOGS! During the month he spent training with Kakashi, he ended up spending a lot of time with Kakashi's dogs. He also grew a lot closer to Kakashi than he's willing to admit. (Ex: he knew where the man lived and went directly into his apartment ffs, plus Kakashi invited him to eat at one point.) But yeah, since all of Kakashi's dogs speak, they were very vocal about what they liked and disliked. Sasuke never really got "along" with any of them, but he knows how to take care of dogs by now. :|
12. Continuing on the Sasuke Vs Animals headcanon, he never had an official contract with snakes. It kind of came along with absorbing Orochimaru. He'd still spent a lot of time around them thanks to Sound village being, well, Sound village, but that's why he never really "bonded" with his summons. (I go off this because Sasuke doesn't use snakes before absorbing Orochimaru or after he's gone, and also because a snake contract is tattooed unto your arms, as far as canon's shown, and Sasuke's arms are bare. Whee.)
13. LAST ANIMAL I SWEAR. Until canon josses me on this, I think for the hawk summon, Sasuke picked it up while he was in Sound. Mostly because he does the whole SNAKE TRYING TO EAT A BIRD BUT O SNAP THE WIDDLE BIRD IS A MOTHERFUCKING HAWK NOW speech to Orochimaru. So, yes. I like to believe Sasuke's retarded symbolic had a reason.
14. Sasuke doesn't remember the first 6-8 months of his time in Sound, mostly because he spent most of it drugged out of his own mind and/or poisoned so he could... build that retarded poison/drug immunity. This was all done 100% of his own accord-- spending almost a year in almost constant catatonia seemed worth it to have any kind of small advantage over Itachi.
15. Sasuke really, really wanted (and kind of still wants) Orochimaru's sword. That's why he also named his Kusanagi. It is a fucking badass sword, okay. SASUKE HAS SWORD ENVY.
16. His first shirt post-timeskip? Part of Kimimaro's old wardrobe. He wore it mostly out of convenience, since most shirts were out with the whole SOMETIMES I GROW WIIINGS thing. It's not like Kimimaro ever got to wear most of his shirts, so he wasn't bothered by the whole "wearing a dead guy's shirt" thing. He was in the middle of a growth spurt, so finding him clothes that fit really wasn't Orochimaru's top priority. Or Sasuke's, mind.
17. His pants are only holding up thanks to the rope belt. If he wasn't wearing it and he tried to move they'd... just fall off. That's why he wears the damn thing. Well, that and it is convenient to hold his sword holster. :U
18. The "infinite hammer space in your wrist" thing was something he asked for-- he needed a more convenient place to be able to carry his weapons. He had the choice to carry a seal in a scroll or to put the seal on his person. Sasuke chose the wrists because that way his arms are already in place to throw the weapons. o/
19. Sasuke dislikes the cold more by principle than because he gets cold. Being born in fire country means things like SNOW NOT REALLY BEING APPLICABLE, and so his reflex to snow is still "this is hard to fight in >|".
20. Since in my head Sasuke sounds like his japanese voice actor (Sugiyama Noriaki, aka Non-tan as per Naruto's seiyuu), he sings pretty well, actually! He's not really trained for it, but it's as good as a guy who never really tried to sing can get. :U
21. btw? Mister Roary, aka sasuke's plush dino from his childhood, is on his old bed in his old room in his old house. The rest of the house is empty save for BLOODSTAINS and DUST. Sasuke's room is almost untouched from his childhood; the only things he brought were his clothes. It's probably all covered in a thin layer of dust now, like a frozen memory of times past. :) yeah I'm depressing.
22. Sasuke's ambidextrous! This is actually pretty much canon but never addressed directly, so. :|b
23. Kusanagi was a birthday present from Orochimaru. Orochimaru gave it to Sasuke on his birthday and called it a birthday present-- Sasuke sneered and was pissed until Orochimaru pretty much followed it up with "now we're going to make you a master swordsman". IT WAS A TRAINING PRESENT, so he didn't sulk angrily pout ... sulk half as much as he normally would have.
24. Sasuke sees different kinds of chakra in different colours. This is canon! As I see it, the colours go like this: Earth chakra is a dull yellow/brown colour, Lightning chakra is a very light blue/almost white colour, Fire chakra is usually orange-y red, Water chakra is dark blue and Wind chakra is very light green/almost white. Then there's yin/yang chakra, which are black and white respectively (ex: Shikamaru's kagemane would be black). Certain things have different colour chakra: natural chakra is a mix of all kinds of "earthly" colours, the tailed demons all have the same "base" colour, but with another added (Kyuubi is, of course, red.), and taking from the anime the magical Orochimaru chakra is purple because I can.
And now NOT taking from the anime, normal base chakra is pale. It's always "almost" a colour, but nothing exact. EVERY LIVING THING HAS IT. Sometimes, people's chakra takes a different tint depending on their elements.
25. AND NOW THAT I HAVE ESTABLISHED THAT SASUKE SEES THE RAINBOW, he also associates people with colours, too, not just chakra-- the most obvious ones being Orange for Naruto and Pink for Sakura. He also associates these colours with warmer, happier feelings. BECAUSE YES HE ASSOCIATES COLOURS WITH FEELINGS. SOUNDS, TOO. Letters, numbers-- basically Sasuke has synesthesia. It's actually something that runs in the Uchiha family.
26. Sasuke is very visual in general, of course. He's a visual learner. It's why he's not so great with genjutsu-- Sharingan lets him get out of it entirely, but to create illusions that scare people truly, he doesn't go with psychological things so much as a visual. He CAN try to go with the general "feeling" of fear, but it's a lot easier for him to just go VISUALITY for the illusion. Sometimes that means the sound/smells/etc are a little off; it's what might tip off a stronger illusionist.
27. He's terrified of going blind, but doesn't work to put it off as far away in time as possible. His vision dimming slowly isn't nearly as terrifying as it going out in one fell swoop, and he's shown himself to be willing to sacrifice anything for power/revenge. That includes his eyesight. The idea of going blind scares him more than actually being blind would past the first few moments. The idea of going blind in space affects him more, mostly because going blind for nothing sucks. 8|
28. Sasuke's sexual drive is pretty much non-existent. He's probably tried masturbating once or twice in his entire life -- but it just feels dirty, a waste of time, a waste of control, childish, immature (embarrassing) ETC to him. He doesn't actually get sexual urges beyond WHEN PUBERTY STRIKES, and that's just hormones. He works it off. He's never been physically attracted to people. His development in that area is heavily stunted. 8|
29. He can, however, tell when someone is physically "attractive" (or who would be considered physically attractive). Sasuke himself only has interest in powerful people, so physical attractiveness is something he can notice and then totally fail to care about. Example: Sai looks like him, so Sasuke is aware he's probably considered "hot" back in Konoha. Example 2: Naruto was a short dunce who never shut up, so no one thought he was hot! :D
30. If Sasuke could do it all over again with what he knows now, he wouldn't have killed Itachi. He would've gone after the elders, and after that, he would have left.
He doesn't know what he'd do with an Itachi he'd know the truth about, but the one thing he would want to do is-- talk. Or, well, yell at him, more like.
31. Sasuke regrets begging for his life when Itachi killed the clan. Mostly because it was cowardly and he hates himself for it; for being weak. But also because sometimes he thinks, maybe if he hadn't, Itachi would have killed him, too-- and, maybe, him dying at that time might have been best for everybody involved.
But Danzo and the Elders would have lived and the thought makes him rage enough that he doesn't dwell on it.
32. Sasuke has an awesome mix of inferiority complex, superiority complex and enough arrogance and PTSD to choke an elephant. I WILL ONE DAY MAKE A POST DETAILING THIS PROPERLY. MAYBE.
33. I think Sasuke lied to Madara and not team Hawk about destroying Konoha. He was honest to god shocked at Konoha's destruction, and he didn't care for killing anyone besides Danzo after he found out. After finding out that Danzo had harvested his family's eyes, yeah, that changed. Thanks for hitting that berserk button, Danzo.
34. TAKING WALKS IS FUN, OKAY?! IT CLEARS HIS MIND. IT IS AN AWESOME HOBBY.
35. He wears civvies on the ship a lot. He tries to get either large t-shirts or turtlenecks and loose jeans/loose pants. He's in the process of sewing a uchiha fan on the lot of it. He keeps his wristbands on. He bought sandals, too. He never wears normal shoes. SANDALS FOREVER. He doesn't go out to meet people in his civvies if he can help it, though.
36. He moved to an apartment a little while after the massacre; at first he was determined to stay in the compound, but there's only so many ghosts and memories a kid can take so he finally caved in to the Sandaime's "suggestions" after about a week.
37. SCENE: During that first week there was a crow; the crowd had red eyes and it stayed next to the room Sasuke slept in. It would caw like clockwork every day at five in the morning. Just before he left, Sasuke got tired of that creepy crow, and mad because it reminded him of Itachi. He tried to kill it after he pretended it WAS his brother-- the minute the rock hit the damn thing he felt inexplicably guilty (because it was an innocent crow; and because it was his brother and he just wasn't ready to face that) and so he buried it. Pretty shallowly, though-- he'd never had a pet so he'd never buried anything before. In the end, a stray cat came and dug it out, and the crow flew away. Sasuke had only managed to knock it unconscious. Oops.
38. For months after that Sasuke would dream of his family being dug out or digging themselves out; they alternated between happy (they were alive and okay) and horrifying-- they blamed him and hated him and, Sasuke, why didn't you try to--
He doesn't like to think about those dreams, but it just fueled his belief that he owed the dead.
39. He has no idea where (if) his family was buried. He woke up long after they'd all been moved; what's been done of the bodies? He doesn't know. He didn't try to find out, either, because what's the point in crying in front of their graves? (Randomly, canon says Danzou stole some of their eyes and then Madara collected the rest of the Uchiha, yay, so luckily for him he doesn't know LOL.)
40. Sasuke doesn't have a lot of visible scars. He's full of tiny pinprick ones from Haku's needles, especially the ones around his neck. He has one on his shoulder from Itachi's shuriken. One on his thigh from when he stabbed himself. A shitload of faded burnt marks on his left hand/arm from chidori! And around his shoulder/neck juncture, two pinprick points that are all that's left of when Orochimaru gave him the curse seal. Plus two giant ones on his shoulder blades because THE BOY HAD WINGS. THAT... THAT SHOWS. The rest is all stuff from training.
41. As much as girls theorized about his likes and dislikes (long hair etc) Sasuke doesn't really have physical specifics that attract him. Long hair just reminds him of his mother (if it's loose) or Itachi (if it's tied back), so that's actually more the opposite feeling from "attraction". LOL.
42. Sasuke thinks the Uchiha should die with him because he agrees with Madara that they're a cursed clan; a cursed lineage. If he ever moved past that, he'd go "oh god no" if he ever had more than one kid, especially brothers. Children wise, he'd actually prefer just one girl, because THERE ARE NO GIRLS IN THE BLOODY UCHIHA HISTORY. But this is in a very far off future tbh. :|
43. On kids in general-- Sasuke doesn't mind them, but he won't coddle them, either. He'll treat them like mini-people. Sasuke himself is only 16 (17?? stupid... gargle canon) so he's actually a kid himself to a lot of people. But since ninjas are adults, he won't accept that. Oops.
44. If Sakura swore up and down that it might actually help his sight instead of just restoring it temporarily, Sasuke might say yes to glasses in a far off future where he is, for lack of a better term, blinder. Otherwise, he thinks it'd be useless and UCHIHAS DO NOT WEAR GLASSES /prances off
45. Sasuke is more likely to sleep sporadically within the day than sleep full nights. He sleeps more fully on the ship solely because he, well, can and has nothing better to do. He still doesn't really like it, and he's extremely easy to wake up. Unfortunately, he's also extremely cranky when he wakes up. Sasuke usually gives himself half an hour to an hour before meeting people after waking because at that point he hates everything and everyone and DIE DIE DIE DIE DIE. <= such a nice person
46. Sasuke is a virgin. He himself doesn't know if that's completely true (it is!) since he doesn't remember, as previously established, a good chunk of his stay in Sound. As far as he's concerned, he can't remember it, so it didn't happen. Plus there would be no point to anyone taking advantage of him if he couldn't remember it. Anyway, he isn't bothered by the thought at all. There's no such thing as "virtue" or "honor" when you're an avenger, and he's pretty disconnected to that kind of thing in general.
47. Sasuke knows that sex consists of putting it in. And then sometimes babies. That's. Pretty much the extent of it. He knows the basics, but ask him about foreplay and he'll just throw a "what do I care" look at you.
48. It took a while for Sasuke to realize there is a reason you clean with gloves on. He fucked his hands pretty bad at one point actually-- he had to go to the hospital, a medic went GOOD GOD WHY WOULD YOU EVER and then he learned: not a good thing. It took him so long to stop because he was half-convinced the cleaning product was punishing him and, well, he deserved it, right?
49. Sasuke thinks of his younger childish self (both before and just after the massacre, up to-- exceedingly recently) and hates himself for being so stupid and naive and ETC ETC what is a healthy self-esteem.
50. <= THIS NEEDS TO BE A BIG ONE NOT WRITTEN AT 7AM somehow
tbc...