Mayoi is very savvy with electronics and almost never seen without her lab-coat. she loves to tease Tsumiki which often brought her severe repercussions from the latter. She is also a very sneaky person with a good sense of humor. She is very fond of games and competition and she's always into teasing somebody.And she's just like Sakaki.
She has bright orange hair and two buns on each side of her head. She is usually seen wearing her school uniform and her lab coat covering it. And in case you are wondering, she has never shown her eyes yet.