Mu is a convicted criminal serving a long prison term for violent crimes before Rei Midoriyama recruits him. His extensive incarceration history provides a chance for reduced sentencing through involvement in Circus organization missions.

Selected as one of two primary Galvion mecha pilots, Mu partners with fellow convict Maya. This pairing establishes Circus's core operational dynamic, deploying their skills against the Shadow organization.

Initially characterized by aggression and violent inclinations aligned with his criminal past, Mu contrasts with Maya's white-collar background, creating distinct interpersonal tensions within the team.

Through successive missions against Shadow, Mu experiences character development. High-stakes scenarios involving civilian protection trigger observable shifts in his motivations and behavior. The narrative framework explores his evolving views on violence, justice, and protective duties.

Planned story progression indicated deeper development, including confrontations with significant personal stakes. Production discontinuation halted this trajectory. The series epilogue resolves his arc through expository narration, detailing unfilmed narrative outcomes.

Mu's complete journey remains partially unrealized in aired episodes due to the truncated series, with the epilogue serving as the official narrative conclusion.

The character's development and appearances are confined to the original television series, without expansion into supplementary media like films, OVAs, or spin-offs. The Knights of the Multiverse wiki reference to Mitsuko denotes an alternate narrative unrelated to Mu's primary canon depiction.