A girl with white hair was abandoned in the outer lands and taken in by Sensei. She wears a simple white dress and has this kind of innocent quality about her—doesn't flinch at Sensei's unusual appearance the way most people would.
What she's really known for, though, is making floral headpieces. She's genuinely talented at it, and fans often note how intricate and thoughtful her work is. It's basically her thing.
Content compiled by AnimeList.moe from publicly available sources.