Haya Kittaka operates as the composed and methodical Operator of Ōji Squad, a high-performing B-rank team. Her light complexion and slender frame complement long, middle-parted light brown hair gathered into a subtle ponytail, while her Trion Body mirrors the standard Operator uniform. Though outwardly poised, she nurtures a fervent love for anime aesthetics, once rejecting numerous high school suitors to prioritize her interests. This passion initially inspired Ōji Squad’s flamboyant uniform concepts, later refined by Kazuki Kurauchi’s practical adjustments. Privately, she dreams of crafting manga, a pursuit rooted in her design-focused education and friendship with classmate Fujimaru.

In combat, her precision shines through rapid analysis of enemy Sniper placements, enabling her to map real-time escape paths onto teammates’ visual feeds. During strategy meetings, she observes Kazuaki Ōji’s proposals with quiet scrutiny before contributing measured insights. Her tactical influence surfaces in Ōji Squad’s battle-stage selections, such as favoring Cityscape A’s uncomplicated terrain, and in adaptive maneuvers like recalculating retreats around Snipers Chika Amatori and Kōji Oki’s blind spots following Kurauchi’s elimination during a match.

Beyond the battlefield, she sharpens her strategic acumen through chess matches with squadmates—a habit spurred by Ōji’s introduction of the game, which ignited covert team practices. Her meals often feature boiled spinach salads paired with kiwi and yogurt. When the Galopoula incursion prompts Ōji Squad’s deployment to secure western and southern perimeters, her role remains consistent, though specifics of her contributions during the operation are unrecorded.