Protoman
A name for a person who seems to be antagonizing you, but who you later realize was helping you prepare for the inevitable.
From Megaman 3, where the character Break Man fights you multiple times, but turns out to be your brother who is helping you train for the final fight with Wily.

Common Protomen are siblings, Teachers, and Parents.
Guy: Man, that teacher is an ass!
Guy 2: You'll see, he's helping you. He's a Protoman.