Mozuku Kunato is a supporting character in Knights of Sidonia. She is introduced as the younger sister of Norio Kunato, though the exact nature of their familial relationship is not clearly defined. She is soft-spoken and deeply loyal to her brother, acting as both a trusting friend and a subordinate who carries out his orders without hesitation. Mozuku is physically unremarkable among the crew of Sidonia, with white hair and grey eyes.

Her primary motivation throughout the early part of the story is unwavering devotion to Norio, whom she serves faithfully. This loyalty makes her vulnerable to manipulation. After Norio becomes possessed by the renegade scientist Ochiai, Mozuku is killed and subsequently revived by Ochiai’s mind-controlling virus. Under Ochiai’s influence, she becomes a puppet used to further his plans, participating in battles by piloting the large humanoid hybrid Tsumugi before the Chimera is able to sortie independently. Her brainwashed state removes her agency, turning her into a tool for Ochiai’s schemes.

Mozuku’s role in the story is twofold: she initially functions as a loyal attendant to Norio, highlighting the Kunato family’s influence and secretive operations, and later becomes a tragic victim of Ochiai’s machinations. Her forced involvement in combat showcases her piloting ability, though she is not a frontline warrior by choice. Key relationships include her brother Norio, whose ambition and eventual corruption directly affect her fate, and Ochiai, who exploits her for his own ends. She has no known notable special abilities beyond standard Garde piloting, and her development is limited by her subservient personality and subsequent loss of free will.