Merrybell Candy Stuart is a 16-year-old English female cyborg with brown hair, green eyes, and a height of 1.58 meters. She belongs to a group of five cybernetically enhanced women fighting for humanity's survival against alien invaders. Operating from underwater bases where human remnants shelter after Earth's surface fell, she navigates her team's spacecraft with reasonable competence despite her aversion to combat.

Merrybell exhibits anxiety and sensitivity, reacting to peril with visible fear or complaints. She deliberately avoids weapons training and displays clumsiness when handling arms. Preferring her quarters filled with stuffed animals over tactical drills, she retreats there during downtime.

Her past involves revival through cybernetics following tragedy, though specifics of her human life remain undisclosed. Like her teammates, she suffers memory loss of her pre-cyborg existence. Her family includes a father, but their relationship and his status are undefined.