Katze operates as a profit-driven weapons merchant specializing in mecha and armaments, employing opportunistic and deceptive business practices that reflect her morally ambiguous, self-serving approach to survival. She initially pilots the Ryu Gunner Derringer alongside her brother, Hittel, though her combat effectiveness proves markedly limited; her piloting skills are barely sufficient to hit targets, significantly underperforming compared to Hittel's capabilities. This inadequacy results in Hittel assuming the role of primary pilot, especially during critical operations demanding marksmanship and agility.

Her relationship with Hittel establishes a distinct dynamic. Katze exhibits cautious, pragmatic, and profit-focused tendencies, contrasting sharply with Hittel's reckless nature and combat proficiency, positioning them as a complementary pair. Katze harbors cynical and abrasive edges, consistently prioritizing financial gain over altruism. Her interactions reveal a strong self-preservation instinct and reluctance to engage in high-risk scenarios without clear compensation.

Visually, Katze is distinguished by practical attire—a tube top and pants—contrasting with more fantastical designs, along with glasses and a snaggletooth, reinforcing her grounded mercantile role.

Her involvement with Adeu's group begins transactionally. However, her continued presence through the conflict against the Helldragon tribe and participation in defending Earth Tear implies developing loyalty beyond pure self-interest. Around episode 44, the Ryu Gunner Derringer upgrades to the Ryu Wyatt Derringer, primarily utilized in combat by Hittel. Katze's operational role transitions towards support or auxiliary functions rather than frontline mecha piloting.