Subaru Ichinose, a genius ace pilot of the Earth Federation, is notorious for his intense aversion to social interaction, seeking refuge solely within the cockpit of his general-purpose humanoid weapon, Durandal. Discomfort with the space battleship’s group dynamics drives his reclusive behavior, transforming the cockpit into a sanctuary where he eats, sleeps, and performs eccentric rituals to manage stress.

He exhibits neurotic quirks, conversing with inanimate objects—most notably a sentient pubic hair that sacrifices itself for his protection. His eccentricities extend to consuming rice directly from his body, insisting saltier patches enhance its taste, underscoring his reliance on unconventional coping mechanisms for emotional stability in isolation.

Strained familial bonds, particularly with his brother Isuzu Ichinose—a member of an opposing faction—anchor critical tensions. Their dynamic shifts after a crash landing on Earth in the sequel, compelling shared survival and unresolved conflicts. Interactions with his father, Sōichirō Ichinose, further contextualize his withdrawn nature, though their shared history remains largely unexplored.

Subaru’s development unfolds through incremental exposure to external environments and social challenges. Initially resistant to life beyond Durandal’s cockpit, encounters with mundane realities—gift shops, underwater bases, terrestrial scenarios—force confrontations with responsibility and routine. Durandal remains his constant, emblematic of both his isolation and core identity as a pilot.

His narrative thrives on comedic contrasts between reclusive tendencies and absurd circumstances, eschewing conventional growth trajectories. Details of his pre-Federation past and evolution across media remain undisclosed, anchoring his story in present challenges over retrospective exploration.