Yuna, a central figure shaped by memory, loyalty, and transformation, possesses pale pink hair and a delicate stature. Her childhood bond with Koku, forged through mutual protection, included a secret symbol blending their identifiers—13 and IV—later adopted as the vigilante Killer B’s emblem. A violent assault on their orphanage severed their connection, plunging Yuna into Market Maker’s clutches, where brainwashing erased her past and embedded unwavering allegiance to the organization, symbolized by a pink clown tattoo beneath her right eye.

As a Market Maker operative, she operated with icy precision, tasked with apprehending Koku during the Jet Black Epitaph incident. Their clash sparked fragmented memories to surface, unraveling her conditioning. Defecting from the group, her tattoo vanished, mirroring her fractured loyalty. Reuniting with Koku, their relationship shifted from adversarial tension to tentative reconciliation as her suppressed identity reemerged.

Recovering in a regenerative pool post-conflict, she resided with Koku under Keith’s guardianship. Proximity to Koku during a crisis briefly bleached her hair white, though it regained its hue after the ordeal. Embracing casual attire and a lighthearted demeanor, she shed her former rigidity.

Tranquility shattered when Kirisame, a shadow from their past at the Faura Blanca Research Institute, targeted Koku, reigniting threats tied to experimental programs. Yuna navigated these dangers, leveraging resilience and her bond with Koku to confront manipulations by Market Maker remnants. Her journey traces a path from indoctrinated agent to self-determined ally, embodying redemption and the persistence of childhood bonds. Through memory’s fragility and loyalty’s duality, her evolution underscores the struggle to reclaim identity amid forces seeking to erase it.