Feles operates as a core member of the Extractors team, specializing in tactical support during escape missions. Her expertise merges firearms proficiency with spellcasting abilities, earning her the designation of "Gun Wizard" through her manipulation of bullets—a role demanding exceptional athleticism and precision.

Her background includes prior involvement with the Kanto Union, a Shinjuku-based yakuza organization. While affiliated, she intervened in a mafia conflict to save President Toichi, forging a connection that later resurfaces when Toichi requests the Extractors' aid for his own escape from Shinjuku. This compels Feles to confront unresolved elements from her past.

Character development intensifies under operational pressure. An injury sustained while shielding Equa during a drone pursuit creates profound conflict, prompting Feles to temporarily leave the team due to concerns about compromising future missions. This decision stems from her perceived inability to fulfill protective duties effectively. Reconciliation occurs when Equa explicitly acknowledges Feles' indispensable contributions, catalyzing her return. This moment reinforces her value within the team dynamic and unwavering commitment to their objectives.