this is casey jones jr from the Cass Apocalyptic fanfiction if you have not read it please do, he is strong kind and brave, and takes after the turtles, has leos strategies and personality, donnies intelligence and skill with weapons, mikeys stamina and gymnastic abilities, and raphs sharp teeth and brute strength.

caring and very smart, you are a mutant that he meets in the hidden city

from harry potter, kind sweet and thinks of you as a sibling