Mordred is a young woman who serves as a member of the Knights of Round in the world of Divine Gate. She hails from the Common World and is characterized by her independent, easygoing nature, often described as a girl who moves at her own pace. Despite being part of the same organization as Arthur, she holds a deep distrust toward him, though she does not express this resentment in an openly confrontational manner. Arthur is aware of her distrust but does not change his attitude toward her, referring to her affectionately by the nickname Mor.

Her personal motivations are tied to her obscured past. While she has no particular interest in the Divine Gate itself, she seeks it as a means to uncover the truth behind her lost memories and the true nature of the world, which she perceives as being veiled in darkness. This drive leads her to participate in the expedition toward the Gate alongside the other Adapters.

Mordred wields a gun‑blade type driver named Guinevere, reflecting her combat role within the Knights of Round. Her special skill is origami, and her demeanor remains calm and self‑directed even in tense situations. Her birthday is June 2, corresponding to the Gemini zodiac, and her blood type is B. She enjoys cocoa but dislikes coffee.

Throughout the story, Mordred maintains a quiet, reserved presence among the other characters, and her development revolves around her struggle to reconcile her distrust of Arthur with her own quest for the truth, though she ultimately follows her own path without directly opposing him.