Odelo Henrik, a 15-year-old refugee from Largaine, witnesses his parents executed by guillotine under the Zanscare Empire. Forced into adulthood, he assumes responsibility as the primary caregiver for his younger sister, Suzy Relane. Alongside his friend Warren Trace, Odelo joins the League Militaire resistance group, starting in support roles before advancing to pilot a mobile suit.

His relationship with Uso Ewin begins with friction but matures into a close bond, with Odelo adopting an older brother role. This connection is strained by Odelo's underlying resentment; he harbors bitterness that Uso joined specifically to find his living parents, contrasting sharply with Odelo's own status as an orphan responsible for his sister. He also forms a protective connection with another young refugee, Shakti Kareen.

While serving with the League Militaire, Odelo develops a romantic attachment to Elischa Kranskie, a resident of Hiland Station, creating a personal anchor amidst the conflict.

Odelo meets his end during the war's final battle. His mobile suit suffers catastrophic damage from an attack by Katejina Loos, resulting in an explosion. Facing death, Odelo experiences a mental connection with the spirits of his deceased parents. This encounter resolves a long-standing personal conflict: he learns his father did not harbor hatred toward him, while his mother acknowledges his efforts, granting him peace. After his death, Odelo appears as a spectral figure alongside other fallen League Militaire members, offering symbolic assistance to Uso.