Secrets of Mikey's past (on hold)

A tmnt and mlp story about a turtle who thought he knew what he was. But the true wasn't that easy. In real no one knew where he came from, or why he was here. No one knew what he was. His past was a mystery full of black spots.
Why is he here?
How did he become a part of this family?
Who was he before he got here?
Do he have an other family somewhere else?
And do his past have something to do with why he have power to control water?