Strangely enough, this came to me when I was in the kitchen. This is what if Riunire Potter, Fem Harry, was the daughter of Michelangelo, who had been made to destroy them by the Kraang. However Mikey rescued her in time, found out who she was, and despite wanting to keep her, knew he had to give her up so she could stay safe. He is the only one who knows of her existance, apart from Shinigami, who made it so she looked human and not like a mutant turtle, and Karai, who Shinigami would have told anyway.

Prolouge: Goodbye, Riunire

A cloaked shadow ran through the night silently as he held a precious bundle close to him.

As he arrived at his destination, he pulled back the hood of his cloak, as he stared down at the child, his daughter, that he knew he may never see again.

Michelangelo smiled at the forms of two women, who stepped out of the shadows.

"Hello, Shinigami and Karai. Thank you for doing this" he told them. He was unusually serious, because of what he was about to do.

Karai nodded and held her hands out silently. Mikey whispered something in Riunire's ear, before he kissed her forehead and handed her over.

A tear rolled down his face, as Karai and Shinigami turned around and walked off, carrying his daughter with them. He watched them get in the car then drive off until they disappeared from sight, then, finally, he broke down as he burst out crying.

"RIUNIRE! " he wailed, as the fact he could possibly never see her again, hit him hard. He managed to send a text to his brothers, who found him crying devastated as he stared into the distance.

Raph looked at Leo and Donnie, before he sighed, stooping and picked Mikey up, who latched onto him, as he kept crying. They headed back home, never knowing what Mikey had lost this day, and they never would until Riunire returned to her rightful home, and to the father who will welcome her with open arms.

Meanwhile, Karai unwrapped the blanket from the baby, to reveal a redhead baby with the baby blue eyes of her little brother. "Hello, Riunire. I'm your aunt, Karai. " she told the baby, despite knowing she wouldn't remember her words.

"I hope, one day, you will know why Michelangelo had to give you up. Just know, we will keep an eye on you, I'll make sure of it" she told the unaware baby as they arrived at the hotel of James and Lily Potter, on vacation in America. Stepping out and approaching the holiday home, Karai set her niece down before she knocked, and fled after dropping a letter in the basket that contained her niece.

Karai watched from the shadows as Lily Potter opened the door and saw her smile, head her squeal and tell James Potter "James! Come look at this!" she told him happily. A man appeared at the door and as he saw the baby, he smiled and said "It appears someone did hear our wish. Wait, a letter?" he asked as he picked it up, and opening it, starting to read it out.

'Dear Sir/Madam,

My name is Hamato Michelangelo, and if you are reading this then you have found my daughter Hamato Riunire.

I had to give her up, as if I had kept her, she would be in extream danger, and though I haven't had her that long, I couldn't let that happen.

The truth is, you can't tell anyone this, is that she was made artifically, meant to be a weapon to destroy me and my brothers, by a organisation called the Foot and a group called the Kraang.

I put a stop to that however, when I rescued her. My only request, is that when she is older, can you tell her to look for a woman called Hamato Karai, her aunt.

Through her, hopefully I will be able to reunite with my baby Riunire again.

Yours sincerely

Michelangelo'

James looked at Lily, who nodded "We have to, James, he is her birth father. For now however we have to pass Riunire off as ours. Whoever you are, Michelangelo, thank you for giving us a daughter."

With that they went back inaide, and Karai moved to the car, rejoining Shinigami who restarted the car and drove off, both hoping one day they can meet their niece for real.