Mayura Souda is a supporting character in the anime Red Data Girl. She is a triplet and serves as the roommate of the protagonist, Izumiko Suzuhara. Physically, she is a teenage girl with neck-length brown hair, often styled with two separate bangs on each side and a red ribbon worn on the left side, and she has brown eyes. She is typically seen in her school uniform and is a student at Hojo Academy, where she is regarded as one of the school's most prominent figures, combining academic excellence with a naturally magnetic presence.

In terms of personality, Mayura is generally cheerful, extroverted, and confident. She has a gentle and charismatic demeanor that draws others to her, and she is often willing to help those around her. Despite her outwardly bubbly nature, she is also deeply thoughtful and introspective, reflecting on her own beliefs and values as she seeks greater understanding and self-development. She is passionate about her convictions, which can sometimes manifest as stubbornness or impulsiveness. Her tendency to pursue many interests and avoid negativity is balanced by a strong sense of loyalty; she is a dependable friend and a valuable ally when others are in need.

Mayura comes from a long line of shrine priestesses and is deeply connected to spiritual traditions. She has a strong sense of pride in her heritage and is determined to continue her family's customs, even when this puts her at odds with more modern-minded peers. Her motivations are rooted in this duty to her family's spiritual legacy as well as her desire to support her friends. She is enthusiastic about her interests, such as photography and exploring old buildings, and she often uses humor and lightheartedness to deflect from difficult situations.

Her role in the story is closely tied to Izumiko Suzuhara. As Izumiko's roommate and close friend, she becomes increasingly involved in the supernatural events surrounding Izumiko. Mayura provides moral support and practical assistance as Izumiko grapples with her own spiritual powers. In some interpretations, Mayura is described as initially friendly but later becomes driven by envy over Izumiko's popularity and beauty, positioning her as a complex figure who can act as both an ally and an adversary depending on the circumstances.

Mayura's key relationship is with Izumiko, whom she shares a close friendship with, though this bond is tested by jealousy and rivalry. She also has a strained relationship with her brother, Manatsu, as the two frequently argue and fight. Her background as a triplet and her family's spiritual lineage are central to her identity and her interactions with others.

In terms of abilities, Mayura possesses strong spiritual power inherited from her family line of shrine priestesses. This allows her to perceive, communicate with, and interact with spirits and other supernatural entities. She is well-versed in the traditions and spiritual practices of her family's shrine, giving her practical knowledge of the rituals and customs that govern the spiritual world in the series.

Throughout the series, Mayura's character develops as she becomes more deeply involved in the supernatural realm and in helping Izumiko manage her powers. She faces internal conflicts between her pride in her heritage and her relationships with those who hold different worldviews. Her journey involves reconciling her cheerful exterior with her more introspective and sometimes envious inner self, making her a layered figure whose motivations are driven by both loyalty and personal ambition.