Yokoi sits right next to Seki-kun, which basically means she's got a front-row seat to whatever strange thing he's doing on any given day. She tells herself she's not interested in his antics, but she can't help getting pulled into them anyway—no matter how hard she tries to mind her own business.
She's actually pretty talented at crocheting and genuinely enjoys it. Her drawing skills, though? Not great. The thing is, she doesn't seem to realize this, which fans often find endearing. It's one of those harmless blind spots that makes her character work.
Content compiled by AnimeList.moe from publicly available sources.