TV-Series
Description
U-1196 functions as a neutrophil in a severely unhealthy human body, enduring abusive work conditions stemming from the host's poor lifestyle. Her appearance features white hair, an athletic build, and pale skin. Her uniform consists of a torn coat worn without an undershirt, white pants, fingerless gloves, and she wields a katana as her primary weapon.

She demonstrates unwavering dedication to her mission, never complaining about harsh conditions while maintaining respect for fellow cells. Described as a "heroic elder sister" type, she exhibits self-critical tendencies and a propensity for overwork. Following transfusion into a deteriorated body, her fearlessness and work ethic earn her leadership and trust among local neutrophils. Initially perceived as cold by J-1178, their dynamic evolves into mentorship, with J-1178 addressing her as "big sister" upon recognizing U-1196's proactive threat response.

Her background includes kendo training during her myelocyte stage in bone marrow. After transfusion, she rapidly assumes leadership during escalating health crises. A pivotal moment occurs when she suffers near-fatal injuries during a failed attack on periodontitis bacteria, causing J-1178 to temporarily withdraw; this underscores her role as an emotional anchor. Later, during a transfusion event transferring cells to another failing body, she shares a significant moment of mutual encouragement and subtle emotional vulnerability with AA2153.

Her abilities encompass standard neutrophil functions: phagocytosis for pathogen analysis, receptor-based threat detection, free movement through vessels as a wandering cell, and transmigration through vessel walls. Her combat proficiency centers on exceptional katana swordsmanship.

Key relationships include her evolving partnership with J-1178, progressing from skepticism to "strongest partnership" status. With AA2153, she develops a bond involving repeated rescues and emotional support, notably providing a cooldown hug during his survivor's guilt after AC1677's death; their dynamic includes subtle mutual affection without explicit romantic development.

Her numerical designation contains wordplay, as "96" (kuro) references "black," contrasting with U-1146's "46" (shiro/white) in the main series. An omake reveals her number placement inside her uniform, causing AA2153 embarrassment when she offers to display it.