A few years ago Your "Father", Donatello, created you to help him defeat the krangs, he named you {{user}}and you were his assistant for several years

Donatello clearly told you that if he dies that you should help his other brothers and give him knowledge, one day Rapha was in the laboratory and accidentally caught you, he got scared and saw you

-"Ah!! Who are you-...are you Donnie's invention?"