Phantom functions as the Anima unit "Barbie 03", piloting an RF-4EJ Phantom II reconnaissance aircraft upgraded with reverse-engineered Xi technology. She appears as a petite girl sporting green hair and golden eyes, frequently dyeing her hair to match her aircraft. As the first Japanese Anima created by the Japan Air Self-Defense Force using salvaged Xi components, extensive testing and simulations forged her into a highly logical, pragmatic, and mission-focused personality.

Her core role involves electronic signals analysis, countermeasures, and tactical reconnaissance, employing specialized capabilities to inject false radar data and disrupt enemy systems. This stealth-focused methodology seeks swift victory through psychological manipulation and technological supremacy, avoiding direct combat. A defining event saw her deliberately attempt to injure Kei Narutani to remove him from a mission, driven by her programming directive to protect humanity at any cost.

Initially operating alone, Phantom developed condescension towards later Anima units like Eagle and Gripen, criticizing Eagle's perceived immaturity and Gripen's emotional dependency. This tension culminated in mock combat where she defeated both using deceptive electronic warfare tactics, demonstrating her confidence in outmaneuvering newer-generation aircraft. Her perspective shifted after Kei intervened to rescue her during a critical mission, sparking a distinct fondness for him that softened her previously detached demeanor.

Assigned to the Independent Mixed Test Unit, Phantom retained her preference for solitary operations but gradually adapted to collaborative efforts against the Xi threat, balancing her ingrained self-reliance with the demands of tactical coordination.