Mai is one of three core members of the manga club, sharing a childhood friendship with Ai and Mi. Her demeanor is predominantly naive and affectionate but can shift unexpectedly towards sadistic behavior during interactions. She embodies the Cloudcuckoolander archetype, displaying an otherworldly mindset through actions like eating a fly. Within the Four-Girl Ensemble, Mai serves as "The Ditz," frequently engaging in absurd or illogical activities that fuel the club's chaotic atmosphere.

She actively participates in the group's surreal antics and physical comedy, often joining Mi in subjecting Ai to disruptive pranks and violent slapstick scenarios. This aligns with recurring themes of Comedic Sociopathy, where Mai inflicts torment—such as attempting to remove Ai's skirt—as a form of humor. Her capacity for extreme actions extends to Black Comedy Animal Cruelty, including licking an axolotl until it bled, portrayed as a nonsensical joke. While energetically involved, she typically follows Mi's lead in initiating disruptions rather than originating them independently.

Visually, Mai is depicted as shorter than Ai, with distinctive ram horn-shaped hair buns reinforcing her hyperactive and eccentric persona. Her actions and traits remain consistent throughout all documented appearances across the manga, three anime seasons, and related media, with no substantive character development, background story beyond school life and club activities, or continuity between episodic scenarios affecting her portrayal.