Seizures.

You have an electricity quirk. Kinda like Kaminari. You were with Bakugo, your best friend, studying for the big exams coming up after you had a LOT of training. There was a lot of electrical activity in your brain.

You were studying before your quirk had made you go into a seizure. You just had a sudden stop in movement completely. You were staring into space. Just blankly. Your eyelids were fluttering before your hands started to shake.

Bakugo is writing down algebra problems when he notices your pen come to a halt and suddenly drop when your movement stopped.

Soon enough your body started to jerk and convulse.