FYI: this happens in the past, sorta like a flashback. I do know how everyone joined the team, but for the purpose of the story, BB's history changes! (I am not stealing credit, so this is very similar to MysticQHBarrel's idea of BB's past in "Ties that Bind") Obviously I don't own anything, if I did then this would be on the show!
All about BB before the teen titans!
3rd person
Beast Boy sat down in the ally way, panting as six guys ran past shouting. He gasped and closed his eyes. When they opened again he was face to face with Brick, the 16 year old thug who loved to beat up on him.
"There you are" Brick smiled reveling yellow, chipped teeth. "You didn't think we were that stupid, did you?"
Beast Boy gulped. Brick's gang smiled at him and started to pop their knuckles.
"Now we're gonna have to give you an extra hard beating. My girl just broke up with me, and that don't make me happy, clear?"
Beast Boy nodded and started to tremble slightly.
"Good, get 'em boys"
Beast Boy closed his eyes.
When they were done Beast Boy was covered in blood and bruises. His head pounded and throbbed and he had one eye almost swollen shut. Just before he passed out he saw a girl about his age push through the few people staring and rush to his side. The last thing he remembered was her leaning over him and feeling his neck for a pulse.
Owww… he turned my head to the side. What happened? Things started to flood back to him and he groaned. Am I dead? I feel to comfortable to be alive after that. His eyes opened and he slowly looked around him. He was in a small room on a mattress that was in a corner, he saw the girl that had pushed through the crowd asleep leaning back against a wall to the right of him. What am I doing here, and why is she here with me…wherever here is… He tried to sit up. The bed squeaked. The girl's eyes flew open and she gasped, realizing what made the sound she shook her head and pushed her hair out of her face.
"Hey, how ya feel?" she asked crawling over so she was right beside him; she pushed him back down so he was on his back again. She smiled.
"You gave a scare there, do you need anything?"
Who is this girl? He shook his head, "I'm fine" he whispered.
He looked her over. She was wearing hot pink shorts, a white tank top with a white zip-up hoodie over it. She had long wavy blonde hair that reached her lower back. Her eyes were a warm brown, and her smile always reached her eyes.
"Where am I?" he asked in a quiet voice.
"I won't bite, you don't need to sound so scared. But anyway, we are in my room, house, call it what you like."
"Do you live here?" he asked, and then felt embarrassed, that was what she had just said.
"Yes…just me, in just this room. It used to be a small office. It is in the old one story work building that has been empty for years. I chose this room because it has a working lock." She smiled like it was no deal.
"You live here by yourself?" Beast Boy furrowed his eyebrows
"Yep, I haven't had parents for as long as I can remember. I have always lived on the street. I live off of change I find on the ground, 'cause I'm supposedly to young to work." She rolled her eyes.
"Oh… I live on the street to, but I don't have a room. I morph a get some coins for that" Beast Boy said trying and failing to sit up again.
"morph…?" She looked down at him, confused "Does that have something to do with your fangs, ears and the fact that your green?"
"yeah… I change in to animals, any animal that you can think of." Beast Boy waited for her to scoff or tell him to get out.
"Really? That's really cool! I can do something special too-" she froze as if she said something she shouldn't have.
"You can do something? Like what?" Beast Boy wandered
"It's nothing, nothing useful anyway. People would only get hurt if I used it." She seemed to talk to herself and said the last word like it was something to be afraid of. Beast Boy decided not to ask anymore questions.
He stayed with her for a week while he got better and they became really good friends. Her name was Katie. Beast Boy found out that she was 14 like him, but she was two months younger. She loved it when he morphed for her and they were almost always together once he could go out again. He moved into a room in the building with her and would sometimes end up in her room at night when she got scared, but he would change into some sort of animal, almost always a dog, so that nothing felt awkward. During the day she would applaud at his street performances and laugh at his goofy jokes. They would run away from Brick together, and they never got caught. Sometimes she needed "alone time" and would go out looking for change to the street all day and would lock herself in her room at night, but she was always okay the next morning. Beast Boy didn't mind, it was just part of who she was. They grew up together and were always there for each other. Beast Boy eventually came to love Katie, not as a sister, but as someone he wanted to spend the rest of his life with. Though their friendship was to important to him to risk telling her that. They knew each other for two years before something happened. Something that Beast Boy didn't know about. But whatever it was, it made Katie disappear. She left without a trace. The only thing that made Beast Boy know she wasn't dead, was the fact that three days after she left the words "I'll miss you" appeared on the wall of her room in purple ink, in her handwriting. The day she disappeared was very normal. The only eventful thing that happened was that in the morning Brick and his gang were throwing rocks at Beast Boy, he was dodging them but Katie saw one that was heading straight for Beat Boy's face. Quick as anything she snatched it out of the air and flicked it back at Brick, hitting him right in the nuts. He cursed and fell forward. Beast Boy and Katie both took off running and soon lost the followers of brick-head Brick and went on with life. Katie said she was going to go for an "alone walk" to calm down and that she would meet up with Beast Boy later. She never did. Beast Boy searched high and low but never found her. Three week later He was found by Robin while being pounded on by Brick a short while after that he joined the Teen Titans. But he never forgot about Katie, he just learned to cope.