Rubis operates within the antagonistic G-Society alongside her partner Saphir. She confronts Ascoeur and Q-feuille during a mission centered on protecting Di-air. Rubis employs a feral transformation ability, adopting feline traits that include striped clothing evoking tiger patterns and extending razor claws or blades from her nails for combat. Her fighting style emphasizes aggressive physical assaults, contrasting directly with Saphir's ice-based techniques. Following Di-air's intervention, which enhances Ascoeur's teleportation capabilities, Rubis and Saphir are compelled to retreat upon the arrival of GTO security forces. Her name originates from the French word for "Ruby," reflecting a thematic naming pattern shared with her partner Saphir (meaning "Sapphire").