Chompers
*Izuku's quirk is teeth. Literally a mouth full of way too much teeth made of an unfamiliar material. Coupled with powerful jaws, Izuku can bite through basically anything.
*Based off that one panel of feral!Izuku biting through AFO's quirk.. we love a feral boy.
*Gender swapped, because we love a feral girl too. And there has to be a reason for Izuku to be outcast and based on other anime a girl who’s shy but not cute and has unladylike behaviors might be it.
*Mix in some anti- mutation quirk discrimination. In manga, those with mutation quirks or quirk attributes are seen as dirty, or deceivers (I think that was the translation). Izuku can more or less pass as "normal" if she keeps her mouth closed, so she's in the lucky spot to be discriminated against by bigots, and not-so supported by others with mutation quirks. Kinda doesn't fit in in either, though there are some in each group who accept her.
*Lil baby Izu-chan meets Gang Orca at a meet. Lil baby girl who stared so intently- but didn't smile once. Until the end. She walks up to him, stops a good distance away. And gives a bit toothy smile. Emphasis on the toothy. Gang Orca returns his own pointy -toothed grin.
*Izu gets flustered, runs and hides behind her mom. Peeks out from behind her legs. "Go on. This is Izu-chan". Kid gets an autograph, a photo, still to flustered to speak. The hero asks for a photo for himself, and Izuku gets flustered all over again. They get a really great selfie, Izu held up on held up on the hero's shoulder; both giving their biggest, toothyiest grins.
*It leaves such a positive experience Gang Orca posts it. And immediately delete it after the flood of nasty comments. Instead he posts a scalding, disappointed commentary.
*Izu-chan sends a letter. 'this wasn't the first time I've heard things like that. But it was the first time somebody stood up for me. Thank you hero Gang Orca!'
*Just Izu biting everything. That's the rest of the fic. She joins ua