Mai is a serious individual, especially around Sakuta Azusagawa. She can be considered as a type B tsundere: she isn't harsh by default, but she can be easily annoyed and come across as somewhat snappy or violent when Sakuta does or says something lewd. She usually responds to Sakuta's openly lewd remarks about her by pinching him, slapping him, or stepping on his foot, but can also be flustered just as easily and her tsundere act fails. Mai tends to ignore and stuff unpleasant feelings down rather than deal with them. Sakuta often points out that she is "dishonest", often lying about her feelings. She and Sakuta enjoy teasing each other, but despite her snarkiness, she's pure-hearted and even shy around Sakuta's jokes.

Mai is very sensitive, polite, levelheaded, helpful, and kind. She also has a very soft spot for Kaede Azusagawa, Sakuta's younger sister. Mai is also very intelligent, she's implied to have very good grades and even helps Sakuta study at one point. Though Mai can be somewhat harsh and strict towards Sakuta at times, and call him a pervert or an idiot, she is genuinely affectionate and kind to him as well, and often says that she loves him more than he thinks.

Before her invisibility was subdued by Sakuta, she harbored deep anxiety over the possibility that she could be forgotten entirely. She was also quite sensitive over the topic of her hiatus, as she still harbored bitter feelings over the circumstances which caused them; these feelings have now subsided since she started acting at another agency. Because of her anxiety, she used to be somewhat distrustful and pessimistic, still remaining a very compassionate person.

All in all, although she's emotional and sensitive, Mai is a really nice and kind individual. Notable examples include when Mai denounced the hospitalization incident as false for Sakuta's sake, and when she gave Kaede a dress both as a gift and to at least spark interest in returning to the outside world.

She's also very selfless, sacrificing herself to save Sakuta from being hit by a car, and even becoming Shoko's heart donor. Still, Sakuta manages to get back in time to save her.

Overall, she can be described as very similar to Sakuta: they're both quick-witted individuals with a sarcastic streak, yet very kind and helpful, with an immensely good heart, and who always do what's right.