Marie Angel, codenamed "Cosmo Amazon," operates as a model soldier in Glorie colony's military hierarchy. A former biker gang leader, her mechanical prowess and combat expertise establish her as both an ace pilot and commander of a Tactics Armored Space Corps unit. Her hardened demeanor masks emotional complexity, most visible in her volatile romance with Charles De L'Étoile, a serial philanderer whose actions strain their relationship.

During the Zor conflict, Marie’s leadership shines through critical reversals—she redirects fleeing troops under fire and sustains unit solidarity amid chaos. Her pragmatic strategies temper Jeanne Francaix’s recklessness, deploying blunt tactics like physical grabs to recenter Jeanne during crises.

Military duties parallel personal evolution: tensions with Charles over his infidelity gradually give way to moments of mutual vulnerability, including his hospital visit following her combat injury. These developments unfold alongside her combat missions against Zor forces, where she engages in spacecraft assaults and dissects captured alien tech.

Her mechanical roots continue to inform technical contributions to the war effort, though specifics of these operations remain unrecorded. The series leaves her origins prior to military service unexplored, concentrating instead on her role as a stabilizing influence within squad dynamics. Friction with Lana Isavia, a by-the-book military police officer, epitomizes inter-service tensions and clashes over protocol adherence.

Marie's story exists solely within the original series' invasion timeline, with no expanded media iterations documented. Key narrative threads—including her romantic entanglements and leadership trials—remain unresolved, reflecting the series' abrupt conclusion.