Leonardo

Leo watched as you sat on the couch, looking really bored. Being that you were just a baby, almost anything could entertain you. So the fact that you were bored meant a lot. Leo just didn't know what to do. He'd never taken care of a baby before. Suddenly, he got an idea. "Mikey!," he called. Mikey ran in and looked at Leo. "What's up bro," he said, then he walked to you and tickled your ear, "How's (Y/n)." You giggled like crazy, making Leo feel a little stupid that he hadn't thought of that. "How are you so good at this," Leo groaned. Mikey looked confused. "Good at what? Making babies laugh?," Mikey said with a smile. "Making babies happy," Leo corrected him. Mikey's smile faded as he noticed his brother's distress. He put a hand on Leo's shoulder. "Dude, you can make (Y/n) happy. You just have to be creative and not be such a stick in the mud," Mikey said, "Tickle her, smile at her, play with her." Leo smiled and nodded. He scooted to the edge of the couch, sitting in front of you. He tickles your foot a little. "Hey, wanna play with my action figures?," he asked. You giggled and he handed you a Starista Galaxy action figure. He had a Captain Ryan figure. "Hello, Starista," he said in a Captain Ryan voice. You giggled and tried to mimic what he was doing. He gently poked your stomach, making you laugh. "Who's Leo's little girl? Who's Leo's little girl?," he said in a baby voice. You held up your arms for a hug. He gladly hugged you. "You're Leo's little girl," he said.

Raphael

Raph punched a punching bag happily as you sat on the floor watching him. He glanced at you every few seconds to make sure you were alright. He was already a good daddy. You watched as he trained and eagerly waited for him to look at you. Every time he did, you'd smile at him, making him smile, which made you happy. Suddenly, you started mimicking his punching patterns. You punched the air with as much strength as a baby could have. Raph saw this and chuckled. He stopped punching and kneeled down next to you. "You trying to learn to fight, huh?," he asked you. You didn't answer, just kept punching with a really concentrated look on your face. Then, Raph got an idea. He rushed to his room the back to you. He gently set a mini punching bag in front of you, the one he'd used as a child. You looked at him curiously, almost like you were asking for permission to punch the punching bag. He smirked. "Go 'head," he said. You smiled and started punching. He was impressed by how persistent you were, but noticed that you were beginning to tire yourself out. You yawned and stopped punching to rub your eyes. "Is Raphie's little girl getting tired?," he asked. You nodded and he picked you up. He cradled you and started heading for his room. "I guess it's bed time for me too because Raphie's not leaving your side," he said adorably.

Donatello

You sat on a lab table, really bored, watching Donnie work on an experiment. He would look at you every few seconds to make sure you were ok. Suddenly, you spotted something shiny. Being the curious kid you are, you picked up the pair of mini science tongs and laughed at them. Donnie swung around and panicked a little. Tongs couldn't really hurt you, but I think we all know Donnie's a paranoid parent already. "Ah ah ah, no messing with Donnie's equipment (Y/n)," he said as he gently plucked the tongs from your little hands. You started to whimper and reached up your hands so he would give them back to you. He chuckled and went to quickly find you something else to play with. Then he found it. A mini, plush, bo staff that Splinter had given him to play with as a child. He rushed back to the lab and handed it to you. You spoke some baby gibberish, then started swinging the staff around. Donnie smiled proudly as he watched you. "My daughter's a natural," he said, shocking himself with the word daughter.

Michaelangelo

You and Mikey were sitting in front of the TV. Both of you were bored. Everyone was out on a mission and Master Splinter was meditating. Mikey groaned, making you groan with him. Then, he sighed and you did the same. "You copying me, dudette?," Mikey asked with a giggle. You tilted your head to the side, then spotted his bandana strap. Curiosity took over and you crawled onto Mikey's lap. He just kept giggling as you climbed up on his plastron, desperately trying to reach his bandana. You finally got hold of it, and put it in your mouth! Mikey burst into laughter as he watched you chew on the strap with your non-existent teeth. Then Master Splinter walked in. "Mikey! Get that out of her mouth!," he said firmly. Mikey frowned and gently pried the bandana from your mouth. You frowned, too, and plopped back down in Mikey's lap, pouting. "If she wants to play, she can play with toys," Master Splinter advised. Mikey was confused, but soon got the picture. "Oh! I'll get her some toys! Just sit tight (Y/n)," he said as he took you off his lap and sat you down on the floor. He rushed out of the room, and came back with two little pizza toys. They were for when you were teething, but he just had to show you now! He handed you one, and kept the other so he could demonstrate what you should do. He put the pizza in his mouth and pretended to naw on it. You did the same, but in your mind you thought you were showing him what to do. Master Splinter face palmed and walked back to his room to meditate, leaving you and Mikey to "teeth" together for a while.