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Here's my headcannon of why Best Jeanist always covers his neck :)
Warnings: choking, strangled by himself, kid in pain, if there's anymore let me know!
So, when he got his quirk he was around 3-4 and he was wearing a long sleeve shirt (more fabric) and he was doing normal 3 or 4 year old stuff. Without anyone in the room, because.. uhh story purposes?
And he activated his quirk, by accident, and he got tangled up in the treads of it. It got tangled on his hands but also around his neck, and he was old enough to know that, that's not safe. So he started freaking out and that made his quirk freak out and get tighter, and he had already had a good amount of thread around his neck. So, the thread started cutting into his neck and he was screaming and crying when they started to do that. His parent(s) came running and calmed him down to runs him to the emergency room. When they got there the doctors had to cut the thread off and he had cuts all in/on his neck, and they were deep so they would leave scars.
That's why he covers his neck, he doesn't like to show them because it might scare people, and he also doesn't really like them either
So, yeah :)) 🧍👍