Mave fights as a fairy within a dimension born from anime fans' collective imagination. Dedicated to combating invading forces called JAM, she operates alongside fellow fairies Super Sylph and Sylphied. She possesses a barely toddler-sized stature paired with the ability to fly. Her combat style is fiercely aggressive, primarily wielding dual knives, and her personality radiates hyperactive energy, often reacting with volatile hostility to perceived threats. This initial aggression targets the human Rei Sugiyama, leading her to lunge at him with her blades.

Her very existence hinges entirely on external attention. Mave and the other fairies exist only through the focused imagination and sustained interest of anime fans in the human world. Shifts in fan attention directly destabilize them; waning interest or focus shifting to newer anime series weakens their forms and presence, facing oblivion. This vulnerability defines their reality.

When confronted by the Forgetter, an entity embodying the erasure of forgotten characters, Mave and the fairies begin rapidly fading as the anchoring anime convention ends. During the conflict, Rei abandons his chance to return home, offering crucial encouragement. This coincides with Mave snapping from hostility towards Rei to active cooperation. She joins the collective effort to defeat the Forgetter, channeling her combat skills into defense within the group dynamic.