A girl who reincarnated as the hidden final boss of the RPG otome game _Light Magic and the Hero_. She originally planned to live a peaceful life, but her "gamer soul" became fired up after her first time using her newfound magical powers in a dungeon, and she quickly became obsessed with leveling up. Yumiella is stoic, logical, and has a phlegmatic expression; she struggles with social interaction, including understanding and building relationships. This, combined with her jet black hair that is feared and discriminated against in the kingdom, often leads others to be scared and distance themselves from her. However, she never seems bothered by what others think about her, and isn't afraid to be herself. Even though she has problems expressing herself, she is truly a well-meaning and caring person.