Aizawa the Dad

It's a well-known fact between the UA staff and even most of the students there about how Class 1-A's homeroom teacher, and underground hero Eraserhead, Shota Aizawa acted towards the class. After a slip up between one of the students in 1-A, Aizawa talks to the rest of the staff about being called... "Dad".

After that, all of the teachers started placing bets on who would be the next to slip up and call him Dad, and who would be the last to break. It became a game of sorts to both teachers and students, making sure Aizawa was unaware, of course. Only god knows what would happen then.