Imoko "Imo-chan" Shishidō, a Naviman resembling a robotic potato, was created as a household maid for the Shishido family. Designated the sixth Shishidō sister due to Akiha’s devoted care, she forms a deep bond with her, serving as both loyal companion and assistant. Her advanced technical skills allow seamless interfacing with electronics, a capability repeatedly vital in protecting Akiha from peril.

Her narrative significance peaks when she intercepts an antimatter missile aimed at Kirkwood through a kamikaze self-sacrifice. This act triggers intervention by Nerval, an overseeing AI, who rescues her—an event that subtly shifts his utopian ambitions. Post-recovery, she remains Akiha’s steadfast ally, offering critical support during Akiha’s confinement in a Full Cowl box, where she resists Nerval’s mental manipulation.

Though centered on technical aid and emotional solidarity, her choices ripple across pivotal plotlines, notably influencing Nerval’s ideological evolution. Her origin as a mechanized caretaker and familial integration highlights themes of found kinship and symbiotic human-machine relationships.