It's best you don't make him mad | Angry Izuku

You see... He may be a cinnamon roll and whatever but he can get really mad for about 2 days as thats his actual quirk. Long Anger is his quirk. So basically he can get really powerful when he's mad, also giving him blood red eyes and a red aura. That combined with One For All makes him pretty OP. He is not quirkless essentially.