Mai Kamishiro and her twin sister Yui Kamishiro are relatives of protagonist Ken Taiga. They wield special powers, including telepathy and precognition, which manifest as shared visions crucial to the plot. These visions foresee events like Tokyo's destruction and reveal Ryu Dolk's dragon mark, later proven as proof of their familial connection.

Descended from the Lion Clan bloodline, they summon and pilot the heavy battle horse mecha Begaruda. This ability supports Jushin Liger in combat, transporting him to defend Tokyo against the Dragon Empire. Their powers also prove vital in awakening the god Agama during the final battle against Emperor Drago, achieved through a collective mental fusion with Ken and Ryu.

Throughout the narrative, Mai and Yui function as a unit with identical abilities and roles, encompassing both combat support via Begaruda and mystical interventions tied to their heritage. Their shared character arc focuses on uncovering their lost brother Ryu Dolk's identity and reconciling his allegiance to the Dragon Empire with their family bonds.

Antagonists subject the twins to peril, such as Empress Zara capturing them for sacrificial rituals to revive Drago, necessitating rescue by Ken and Ryu. Outside battle, they participate in everyday interactions with Ken and Goro Dan, including moments like confronting them over peeping during bath scenes. No official media provides distinct development, backstory, or traits for Mai Kamishiro separate from Yui; their backgrounds, abilities, and narrative contributions remain uniformly shared.