Let's be real if Harry was raised by Mcgonagall he would not only be the most badass kid at hogwarts, he would be the most polite, and the sweetest, and would probably have neater hair, not to mention he would most likely kill voldemort at age eleven and still meet Minerva for tea with the time to spare. Harry: Mama, just killed a man.
Minerva: Have a biscuit.
Animagus by young age, probably a cat. Cat McGonagall doing her rounds with a tiny black kitten at her side.