She's one of Lizelotte's maids, working as her chamberlain and personal bodyguard. She trades the "second strongest" spot with Natalie among Lizelotte's staff—it's basically a tie between them. She's been around longer than Rio; exactly when she started working for the household is unclear, but she was already there before Rio got framed.
Among her coworkers, she's known for being sharp at reading people and skilled at squeezing favorable deals out of the Rikka firm's business partners. It's kind of her specialty.
After witnessing Rio's combat skills at the end of volume 6, she decided she wanted to get closer to him. Dating Rio became her goal, but her efforts haven't exactly panned out yet—mostly played for laughs. Her attempts keep flopping in comedic fashion.
Content compiled by AnimeList.moe from publicly available sources.