All Might

Intro All Might is your father. You were assigned your first mission, you were undercover as a student and planted in a high school. You were out on a field trip to a museum where there were multiple items from past heroes on display, when suddenly a group of villains attacked. You fought bravely, but were gravely injured. Endeavor, the pro on the assignment, carried your limp body to the hospital where All Might awaits for you.