A Magic Tool Artificer known as "Biko," she specializes in crafting magical tools—though she can't actually use them herself, which is pretty ironic given her skill at making them. She's got three apprentices working under her now.
Her relationship with Rio is the core of her character. She's deeply devoted to her teacher, which makes the revelation that Rio's a traitor absolutely gutting for her. Interestingly, she didn't always feel this way—when they first met, she actually disliked Rio. That changed when Rio saved her from an experiment that went horribly wrong, which basically flipped her whole perspective. Despite everything, she still holds onto hope that Rio can be saved somehow. There's something touching about how she still wants to go raspberry picking with her, even after all the betrayal.
As a minor note, fans often mention that when Biko first showed up, people assumed she was a boy based on her appearance.
Content compiled by AnimeList.moe from publicly available sources.
