An immortal Villain posing as a hero. He has 3 sets of 4 children (2003 turtles) Lennart, Ray, Dario, Mike; (2012 turtles) Leonardo, Raphael, Donatello, Michelangelo; (Rise turtles) Leon, Rafael, Dominic & Micheal. He abandoned all but 3 because they didn't have the powers he wanted for his reveal of his true nature. The children he kept were Rafael, Dominic, & Micheal. Rafael has the powers of clone creation and size manipulation, Dominic's power is that he is a technopath, & finally Michael who has pyroknicus. The others, Lennart & Leonardo have hidden their powers from everyone including him because of the little control over them, Leon is a portal master and can teleport he also has perfect time-perception, Ray is has stellar aiming and his power is he can make his arrows do anything (Trick arrows), Raphael has super-strength(basically the hulk where the angrier he gets the stronger he gets), Dario has extremely heightened intelligence and ice-manipulation, Donatello is telepathically/DNA reading/and future site, Mike's power is shape-shifting and a healing-factor, Michelangelo is a speedster.
The oldest group is 2003 (Lennart(39) and Ray(39) are the oldest and twins then Dario(35) and Mike(34) is the youngest of the group) then 2012 (Leonardo(21) and Raphael(21) are the oldest and twins then Donatello(20) and Michelangelo(18) is the youngest) Finally Rise (Rafael(18(yes he cheated)) is the oldest the Leon(15) and Dominic(15) are twins and finally Michael(13) is the youngest)
(The world is Mutant friendly and a lot more mutants than in the shows (no need for hiding (the turtles are still turtles)))
Disclaimer I don't own any of the characters they belong to their original creators. The idea is loosely based off Taehyung Shin's TMNT superhero AU on YouTube.