I have a hunch that this is badfic.
While on the search for good Teen Titans AS fanfic (it does exist, believe it or not), I found this:
Just a Hunch
A new Titan joins, and Beastboy falls for her. A Terra replay? Something dangerous is stirring in Raven's mind, but is the unknown always dangerous? Sparks fly, and suspicions arise as a new villain appears. BBxRae StarxRob
So we enter the fanfic as the Titans have finished off some bad guy and are being mobbed by fans. Beast Boy (or Beastboy, as he's known in this fic) is talking to a Mary Sue.
“Umm, yeah, wow, you’re awfully quiet, because I heard you were really jokey and funny and cool and everything, because that’s what my sister said, when I asked her to go meet you, and then I begged her to tell me everything-----I mean, wow, you’re kinda quieter than I imagined…” She broke of embarrassedly, as if she had said too much. ‘Damnit Mariana, why do you have to have such a big mouth. URGH, he’s gonna think I’m a stalker or something..’
“Wait, you got your little sister to spy on me for you? That’s…awesome! Dude, that’s beyond awesome..cuz it’s just me, you know? And whoa, did I tell you that I LOVE the highlights? But they might be a little too..limey, because see, my hair here?” He pointed at his hair,” it’s a more brownish green, and…” He rambled on, with Mariana squeaking excitedly at everything he said, and both waving their arms madly at every point.
Yes he just said it was awesome that he was being spyed on. D:
Then they go home.
“...Anyways, guys, she’s really good at martial arts, cuz she’s been taking lessons, and she’s super smart with computers, and she loves helping people, and animals, and she’s really good at athletics, and she totally looks cool, and Robin, Robin, could she PLEASE be a Titan?”
"Hey, I just met this random chick today, can she join our team of superheroes even though she has no superpowers and we've already been betrayed once before by someone who we thought was our friend?"
And then they install some AIM crap where the author can type two chapters all in an IM format. Screw dialogue, this is easy! But Marianna AKA Mary Sue hacks into the chat. The impossible-to-break-into-chat. But it's okay because she's a Mary Sue.
Mariana has signed in.
Robin: WHAT?
Beastboy: Mariana!!!!!!!! OMG, how did you GET HERE????
Robin: What? HOW CAN THIS BE???
Raven: So this is the famed Mariana…
Starfire: New friend Mariana??? The green haired girl? Yes, please join us!
Robin: How did you even GET ON THIS NETWORK?
Cyborg: The network is supposed to be filled with security. It’s practically impossible to hack it!
Robin: You did hack on, right?
Mariana: hiiiii. Yeah. I hacked.
Beastboy: OMG! You’re SO SMART.
Cyborg: yeah, I gotta admit, that’s pretty cool. And..really hard.
Then later:
Cyborg: That’s SO awesome that you HACKED my security! THAT’S JUST AWESOME.
Robin: yeah, how did you manage?
Mariana: I just…did. It’s really easy… My mom thinks it’s rocket science or something, but...I just...do it. Well, just this once. I’ve always been good with computers.
Beastboy: SEE ROBIN?? I TOLD YOU SHE WAS AWESOME.
This author should win an award for most OOC Cyborg.
Then Marianna Sue shows up the next day for a playdate or something.
“Hi!” Mariana waved at the four dumbstruck Titans. She was wearing the top of Beastboy’s suit, Starfire’s skirt, and Raven’s blue boots.
...
“Well, I----” Mariana began, but then she was cut off by Raven, “ Who gave you my boots?? Beastboy?? You had no right, NO RIGHT at ALL!!! Ugggh, ARAGHH!!” her eyes began to glow red. “Uhhh, that’s bad, right?” Beastboy asked no one.
Wacky hijinks ensue with Demon!Raven, and they decide to let Marianna move in.
Idk why. Because she's so perfect or something.
Mariana’s parents had agreed to a weekly routine. She would go to school every Monday Wednesday, and Friday, be picked up, and head straight for Titans tower and stay the night, and then be returned to school on Tuesdays and Thursdays and live a normal two days. Weekends were different, though. She stayed over on weekends too. They all agreed to this because crime rates seemed to be lower on Tuesdays and Thursdays. It was strange.
What's strange is that they let a random stranger move into their house; and also that her parents let her move in with people she barely knows and they have never met.
BUT MARIANNA HAS SUPER POWERS! Because no one guessed that.
“They’re actually a power. She can feel the future. She can sense things. Those aren’t coincidence. Those are an actual gift. They’re quite powerful for her just beginning to know about them. I think…with time with the Titans, she could be…well, really good.”
I'll skip to my favorite part. Raven and Marianna are in a cafe doing a training session (or something) and Raven is hilariously OOC.
Mariana took Raven’s hand and place it on her forehead. The surrounding tables looked at them like they were insane. Raven closed her eyes, and so did Mariana. Images of Mariana’s youth, and her life flitted into her mind. Images of her life now, and before. Before the Titans, after the Titans. Her small crush on Beastboy before the Titans. Her friendship with him now. Her small want for something more. Her gratefulness. Her absolute goodness. She was pure as a dove. Raven put down Mariana’s hand.
“That’s too much. Thank you, but I feel like I’ve been imposing.”
“Oh. I’m sorry.”
They both looked at the table awkwardly.
“Here. Let me show you.”
Raven placed Mariana’s hand into her hands. "Now let me show you, and let your mind turn it into images."
Mariana did so. She saw Raven’s birth. The prophecy. Her feelings of hatred. Her mind. Her fear of the prophecy. Her being the portal. Becoming the portal for Trigon. Her fear for her friends. Her fear of her inner hatred rising again. How she conquered her prophetical fate. And something about Beastboy, but Raven let go of her hand at that. More like threw it. Ouch.
There's more, involving shopping, a ball, and a ton more of OOC Titans, but I'm sick of reading it for now.
Just a Hunch
A new Titan joins, and Beastboy falls for her. A Terra replay? Something dangerous is stirring in Raven's mind, but is the unknown always dangerous? Sparks fly, and suspicions arise as a new villain appears. BBxRae StarxRob
So we enter the fanfic as the Titans have finished off some bad guy and are being mobbed by fans. Beast Boy (or Beastboy, as he's known in this fic) is talking to a Mary Sue.
“Umm, yeah, wow, you’re awfully quiet, because I heard you were really jokey and funny and cool and everything, because that’s what my sister said, when I asked her to go meet you, and then I begged her to tell me everything-----I mean, wow, you’re kinda quieter than I imagined…” She broke of embarrassedly, as if she had said too much. ‘Damnit Mariana, why do you have to have such a big mouth. URGH, he’s gonna think I’m a stalker or something..’
“Wait, you got your little sister to spy on me for you? That’s…awesome! Dude, that’s beyond awesome..cuz it’s just me, you know? And whoa, did I tell you that I LOVE the highlights? But they might be a little too..limey, because see, my hair here?” He pointed at his hair,” it’s a more brownish green, and…” He rambled on, with Mariana squeaking excitedly at everything he said, and both waving their arms madly at every point.
Yes he just said it was awesome that he was being spyed on. D:
Then they go home.
“...Anyways, guys, she’s really good at martial arts, cuz she’s been taking lessons, and she’s super smart with computers, and she loves helping people, and animals, and she’s really good at athletics, and she totally looks cool, and Robin, Robin, could she PLEASE be a Titan?”
"Hey, I just met this random chick today, can she join our team of superheroes even though she has no superpowers and we've already been betrayed once before by someone who we thought was our friend?"
And then they install some AIM crap where the author can type two chapters all in an IM format. Screw dialogue, this is easy! But Marianna AKA Mary Sue hacks into the chat. The impossible-to-break-into-chat. But it's okay because she's a Mary Sue.
Mariana has signed in.
Robin: WHAT?
Beastboy: Mariana!!!!!!!! OMG, how did you GET HERE????
Robin: What? HOW CAN THIS BE???
Raven: So this is the famed Mariana…
Starfire: New friend Mariana??? The green haired girl? Yes, please join us!
Robin: How did you even GET ON THIS NETWORK?
Cyborg: The network is supposed to be filled with security. It’s practically impossible to hack it!
Robin: You did hack on, right?
Mariana: hiiiii. Yeah. I hacked.
Beastboy: OMG! You’re SO SMART.
Cyborg: yeah, I gotta admit, that’s pretty cool. And..really hard.
Then later:
Cyborg: That’s SO awesome that you HACKED my security! THAT’S JUST AWESOME.
Robin: yeah, how did you manage?
Mariana: I just…did. It’s really easy… My mom thinks it’s rocket science or something, but...I just...do it. Well, just this once. I’ve always been good with computers.
Beastboy: SEE ROBIN?? I TOLD YOU SHE WAS AWESOME.
This author should win an award for most OOC Cyborg.
Then Marianna Sue shows up the next day for a playdate or something.
“Hi!” Mariana waved at the four dumbstruck Titans. She was wearing the top of Beastboy’s suit, Starfire’s skirt, and Raven’s blue boots.
...
“Well, I----” Mariana began, but then she was cut off by Raven, “ Who gave you my boots?? Beastboy?? You had no right, NO RIGHT at ALL!!! Ugggh, ARAGHH!!” her eyes began to glow red. “Uhhh, that’s bad, right?” Beastboy asked no one.
Wacky hijinks ensue with Demon!Raven, and they decide to let Marianna move in.
Idk why. Because she's so perfect or something.
Mariana’s parents had agreed to a weekly routine. She would go to school every Monday Wednesday, and Friday, be picked up, and head straight for Titans tower and stay the night, and then be returned to school on Tuesdays and Thursdays and live a normal two days. Weekends were different, though. She stayed over on weekends too. They all agreed to this because crime rates seemed to be lower on Tuesdays and Thursdays. It was strange.
What's strange is that they let a random stranger move into their house; and also that her parents let her move in with people she barely knows and they have never met.
BUT MARIANNA HAS SUPER POWERS! Because no one guessed that.
“They’re actually a power. She can feel the future. She can sense things. Those aren’t coincidence. Those are an actual gift. They’re quite powerful for her just beginning to know about them. I think…with time with the Titans, she could be…well, really good.”
I'll skip to my favorite part. Raven and Marianna are in a cafe doing a training session (or something) and Raven is hilariously OOC.
Mariana took Raven’s hand and place it on her forehead. The surrounding tables looked at them like they were insane. Raven closed her eyes, and so did Mariana. Images of Mariana’s youth, and her life flitted into her mind. Images of her life now, and before. Before the Titans, after the Titans. Her small crush on Beastboy before the Titans. Her friendship with him now. Her small want for something more. Her gratefulness. Her absolute goodness. She was pure as a dove. Raven put down Mariana’s hand.
“That’s too much. Thank you, but I feel like I’ve been imposing.”
“Oh. I’m sorry.”
They both looked at the table awkwardly.
“Here. Let me show you.”
Raven placed Mariana’s hand into her hands. "Now let me show you, and let your mind turn it into images."
Mariana did so. She saw Raven’s birth. The prophecy. Her feelings of hatred. Her mind. Her fear of the prophecy. Her being the portal. Becoming the portal for Trigon. Her fear for her friends. Her fear of her inner hatred rising again. How she conquered her prophetical fate. And something about Beastboy, but Raven let go of her hand at that. More like threw it. Ouch.
There's more, involving shopping, a ball, and a ton more of OOC Titans, but I'm sick of reading it for now.