Claudia McCunnen stands among the three top executives of Inferno, a formidable criminal syndicate pursuing global underworld unification. She commands vast wealth and wields significant influence, frequently acting as the organization's negotiator with other criminal factions. Her striking appearance features waist-length golden hair, with bangs obscuring the left side of her face, complemented by piercing golden eyes and a preference for revealing purple attire that accentuates her large bust.

A profound trauma fuels her drive: the murder of her brother, Romero. This event propelled her into Inferno's ranks, convinced the organization harbors answers about his death and driven by a thirst for vengeance against those responsible. This personal history profoundly shapes her actions, particularly her calculated relationship with Zwei. Recognizing his uncanny resemblance to Romero, Claudia befriends and manipulates him, weaving a bond instrumental to her agenda. She leverages Zwei's skills while subtly feeding him fragments of his own forgotten identity, ensuring his unwavering loyalty.

Her strategic cunning manifests across missions, exemplified by orders for Zwei to shadow and assassinate family members of targets resisting Inferno's control. Claudia employs psychological manipulation as a core method, presenting a facade of alliance while covertly advancing her objectives. The OVA adaptation presents a portrayal contrasting with other media, omitting her dual nature and manipulative tendencies.

Lizzie Garland serves as her primary bodyguard and childhood confidante, maintaining staunch loyalty despite Claudia's intricate schemes. Claudia's ultimate goal focuses on consolidating power within Inferno to uncover the truth behind her brother's murder and exact retribution, utilizing Zwei as a pivotal instrument in her meticulously crafted plans.