haha i'm kidding. actually -- i wish you would write a fic where it's a quirkswap: himiko has always had electrification and denki has always had transform.
ALRIGHT SO:
there's a few ways this could go but i think the most fun would be if switching quirks also switched their hero/villain alignment.
himiko is going to UA, maybe just as the general track, and she's not super sold on heroics and she's still pretty self centered. meanwhile, denki has a blood related transform quirk that got him bullied to heck in elementary and middle school and he chooses not to go to high school. but denki doesn't have that unhinged core himiko does, so he'd go get a job at a convenience store, run with a slightly bad crowd (other people with "bad" quirks and are jaded with society), and occasionally shoplift minor things.
one day himiko would be in the same store as him and watch him steal something and think, "ugh, i go to UA, i should say something... ugh, what a pain." but she's not motivated enough to get actual heroes involved or cause a fuss; and it was just like pack of gum or something. so instead she follows him out and into an empty alley and then says, "hey! thief!" intending to give him a talking to, but denki FREAKS OUT and starts babbling and apologizing for ever being born and begging her to not take him to jail. himiko finds this a bit annoying at first but the longer he goes on the more funny this guy seems, and she ends up interrogating him about his life and his job and his quirk. then she finds out he has a transformation quirk.