Mob is initially resistant at first, as he states he’s already receiving ‘hero training’(really, vigilante work) from the ‘21st century’s greatest psychic hero’(in reality, a quirkless vigilante) Reigen Arataka! also known as Salt Punch Man. Or something like that. Izuku is very concerned for Mob’s well being.
Then Izuku notices that Mob is staring at Tsubomi and says something along the lines of ‘being a pro hero is totally going to impress Tsubomi and make you popular’
and of course Mob immediately is on board with this decision. Much to Reigen’s dismay, Mob begins training with Izuku after school.
On the day of the actual exams, they are placed in different battle arenas. Izuku’s exam is aligned with what happens in canon(he saves Ochako, nearly breaks all his limbs holy shit), while Mob’s goes on to be a bit different.
Mob ends up in class 1C, not because he’s incompetent with his psychic powers, but because during his exam an accident occurs that causes ???% to appear and wipe out everyone on the arena. This includes all other examinees as well as all the battle bots, so while Mob earns a crap ton of combat points, much of this is offset by the negative rescue points he ‘receives’ from knocking out the other combatants.
On the first day of class, rumors go around the school about this super overpowered kid in class 1C that destroyed nearly every bot in their arena.
oh yeah, and most of the kids who are in 1C are in it because of mob. lol
Mob tries to survive UA along with the other esp-quirk kids in his class, Reigen finds himself increasingly in need of Mob’s quirk, Shenanigans ensue.