Xia Xia, a D-rank Regular formerly operating as an information seller on the 28th Floor, possesses distinctive rabbit ears, light brown-blonde hair, and amber eyes. Her attire shifted from bright red robes with a face covering to a red dress during the Hell Train arc. Driven by an intense preoccupation with financial gain, she consistently demands payment before undertaking tasks and exhibits deranged behavior under high stress, such as during the Hand of Arlen detonation. This monetary focus stems from her species' requirement for substantial funds, though the specific reasons are undisclosed; at least one other member of her species aims to become a Ranker. Recruited by FUG to eliminate E-rank Regulars viewed as competition for Jyu Viole Grace – whom she called her "God" while affiliated – Xia Xia orchestrated events at the Hand of Arlen. She directed Horyang to Cassano, manipulated Viole into targeting Ran and Novick, and hired assassins to eliminate individuals approaching the structure. Escaping the explosion with Ran and Novick in a pod, she revealed her objective was to enhance Viole's reputation as a FUG Slayer candidate. Serving as the Light Bearer on Viole's FUG team during the Workshop Battle, she utilized three Lighthouses for surveillance and coordination. She monitored enemy movements and directed teammates during attacks. Xia Xia expressed concern when Viole declared he wouldn't fulfill his followers' wishes, warning him that "Gods who don't make wishes come true are of no use to humans." She questioned his emotional state after witnessing FUG supporters' suffering and won her designated round in the tournament. She later betrayed FUG during the Thorn retrieval mission, assisting Viole in rescuing hostages after FUG promised her payment, motivated by an undisclosed need for Viole. Subsequently, Khun recruited her into a support team focused on gathering intelligence and hunting Rachel. In the Hell Train arc, she joined a team searching for Cassano, relayed messages about Khun's delay, and used her Lighthouses to block a guardian's attack in Train City. She also guided Edin Dan and Beta through a maze under Hwa Ryun's direction to assist Regulars targeting Rachel's group. At Name Hunt Station, she expressed irritation with Ran's demands but remained with the team. She initially refused to assist in Ran's fight without payment, though later acknowledged the danger and suggested intervention; Novick advised waiting. Proficient with her three Lighthouses, her combat value during the Development Tournament was assessed at 70,000P, equivalent to teammate Yuto. Xia Xia transitioned from a FUG operative to a member of Khun's intelligence and support team, maintaining her pragmatic approach while demonstrating loyalty shifts tied to financial interests and strategic needs.