TV-Series
Description
Christina transitions from antagonist to supporting figure across the events. She bears the title "Regina Geas" as one of the influential Seven Crowns. Her background includes leadership as former vice-captain of the guild Nightmare and former guild master of Round Table. She later shifts to producing the idol guild Carmina.

She wears a cat ear headband. Her personality exhibits ambition, combativeness, and pragmatism in forming alliances. Violent tendencies surface when angered, shown during her rampage through the palace after betrayal. She maintains hierarchical relationships, asserting authority over subordinates like Tomo and displaying transactional behavior, such as negotiating mission exchanges with Karyl.

Her story initiates conflict by leading Royal Knights to attack the beastfolk guild Caon, deliberately provoking confrontations with members like Kaori and Makoto. During this assault, she counters attacks and inflicts severe injuries, demonstrating combat superiority. Saren, her former Nightmare colleague, intervenes to halt the battle.

She later undertakes covert operations, abandoning a Nightmare mission to track the guild Labyrinth on Princess "Eustiana von Astraea's" orders. Encountering Karyl during this task, she brokers a deal: taking over Karyl's assignment to assassinate Pecorine in exchange for secrets withheld by the Princess. This leads to her pursuit of Pecorine, interrupted by Yuuki falling from the sky.

Key development occurs when Princess "Eustiana" betrays her, declaring Christina expendable despite her loyalty. Surviving a battalion-level magical attack due to Labyrista's intervention, she awakens imprisoned in Landosol's dungeon. Imprisonment triggers introspection about her survival and the significance of a crown brooch given by Muimi before the blast. During incarceration, she encounters Muimi and Daigo, allying with them to escape via teleportation. This partnership forms because Muimi cites a debt Christina doesn't recall. Accepting the alliance furthers her integration into Labyrinth's activities starting in Arc 1, Chapter 8.

Her combat relies on physical prowess. Primary skills involve self-enhancements: boosting physical attack power, TP recovery rates, and critical damage output. Signature techniques include "Overlay+" for sustained battle buffs and "Numbers Avalon," a variable-damage system using a coin resource mechanic. Her fighting style incorporates positional tactics, briefly moving forward during certain attacks before retreating. A holiday variant features modified skills like "Enchant Present+" for team support and "Duality Avalon" as her Union Burst, maintaining the coin-based damage mechanics.

Relationships include deference to Saren's authority, adversarial tension with Pecorine, and utility-driven dealings with Karyl. Connections to figures like Jun, Tomo, Matsuri, Labyrista, and Yuuki exist but lack extensive elaboration.