Kaya, a civilian within Wall Rose, emerges as a pivotal figure after Sasha Blouse rescues her during a Titan assault. When Titans breach the wall, Kaya and her mother are left behind in their village due to her mother’s impaired mobility. After a Titan consumes her mother, Kaya freezes in shock until Sasha intervenes, guiding her to safety. Sasha sacrifices her horse to ensure Kaya’s escape, prompting Kaya to rally nearby survivors to aid Sasha against the Titan. Following the attack, the Blouse family takes her in, where she adopts refined attire and assimilates into their household. Though initially calm and reserved, Kaya grapples with forming bonds yet cultivates a quiet resolve to mirror Sasha’s selflessness. This determination faces its first test upon meeting Gabi Braun and Falco Grice, Marleyan children disguised as refugees. Despite overhearing their true identities, Kaya shelters them, offering food and refuge. She later challenges Gabi’s condemnation of Eldians, asserting her mother’s innocence as a lifelong Paradis resident. Inspired by Sasha’s legacy, Kaya arranges a meeting with Niccolo, a Marleyan restaurateur, to help Gabi and Falco return home. Discovering Gabi killed Sasha triggers a violent outburst; Kaya lunges at Gabi with a knife before being subdued, revealing her capacity for vengeance. During the Yeagerists’ coup, the Blouse family is imprisoned in Shiganshina. After escaping, Kaya is separated from them during a Titan attack and cornered in an alley. Gabi saves her, and Kaya momentarily mistakes her for Sasha. When soldiers question Gabi’s identity, Kaya shields her by claiming familial ties. This act sparks a mutual recognition of their shared flaws and the internal “devils” driving their actions, influenced by Niccolo’s reflections on humanity’s universal potential for violence. Later, Kaya bids Gabi farewell as she departs to aid Falco, signaling fragile reconciliation. Three years post-Rumbling, she stands with the Blouse family and Niccolo at a Yeagerist ceremony. Her journey traces a path from trauma-fueled hatred to a complex understanding of forgiveness and interconnected humanity, shaped by her bonds with Sasha, Gabi, and Falco.