Mario's little strand of hair he cant get rid of is weirdly part of his quirk. Remember Matilda? He's in a similar situation, only he knows how to control it, and has sectioned it out of his brain, and it ended up in his hair. Basically its like a storage spot for smarts, and if he drained it he probably would be able to cure Covid in a day
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MHO dorm 8 Head Cannons
FanfictionKeep in mind i only watch a few channels and don't really have a bunch of the character plot down yet.