Rene

An eight-year-old girl who lived as an orphan in the royal capital of the Kingdom of Belfast made a living by pickpocketing. Her mother died shortly after giving birth, and her father, who was an adventurer, never returned from a monster subjugation quest. One day, after she stole Touya Mochizuki's wallet, she was accosted by other pickpockets in the same trade. However, Touya rescued her. At Touya's suggestion, she began working as a maid for the Mochizuki family for the purposes of rehabilitation and supervision. In the anime adaptation, there is no scene in which she steals Touya's wallet; instead, Touya witnesses her being harassed by other pickpockets.

In truth, she is the daughter of Stephanie Rillettes (commonly known as Steph), the eldest daughter of the Rillettes family, one of the "Twelve Imperial Swords" who served the first emperor of the Empire. She meets her aunt, Caroline Rillettes, and her grandmother, Mary, who express their wish to welcome her as a member of the family. However, she chooses to continue her work as a maid of her own free will. Using the "Gate Mirror" gifted to her by Touya, she exchanges letters with her grandmother.

She is close in age to Sushie Ernea Ortlinde, and they often practice magic together. She also seems to be learning combat techniques from Lapis and Cecil.