Luce Rubis is a character from the anime The Exiled Heavy Knight Knows How to Game the System, based on the light novel and manga series. She is the female protagonist and a key companion to the main character, Elma Edvan. Luce is a young girl with short light-blue hair and dark purple eyes, typically dressed in a clown or jester costume that reflects her class. Her class is that of a thief or jester, and she possesses a notable ability called Great Luck, which increases the chance of obtaining high-rarity item drops from enemies. She also wields a claw-like weapon associated with her thief class.

Luce comes from a troubled background. Before meeting Elma, she was part of a previous adventuring party where she was mistreated. Her former party leader controlled how she allocated her skill points, leaving her with almost no offensive capabilities. As a result, she was underutilized and undervalued. After joining Elma’s party, she finds a more supportive environment where her skills are better appreciated and developed.

Personality wise, Luce is described as confident, bright, and humble. She maintains a cheerful and happy demeanor even in difficult situations, and she adapts well to her new role. Her motivations are shaped by a desire to prove herself and to contribute meaningfully to her team, moving past the limitations imposed by her previous party. She develops a close dynamic with Elma, who helps her grow stronger and regain her confidence.

In the story, Luce serves as a deuteragonist and a source of both support and strategic utility. Her Great Luck ability proves valuable for acquiring rare items, and her thief skills complement Elma’s heavy knight combat style. Her character development focuses on overcoming past mistreatment and realizing her potential within a team that values her. While the anime has not yet aired, her role in the source material establishes her as a loyal, resourceful, and optimistic companion.