Mai comes across as a friendly though flirtatious person, being talkative and excitable, though occasionally obliviously making remarks that may make people uncomfortable; such as asking Sara to rub her cheek to compare the materials used to construct her doll-form. She tries her best to help the group, though sometimes her ideas lack foresight; especially shown in the optional bad ending in which she lights a firework inside of a library to fight monsters, leading the room to be engulfed in flame with no exit.

Despite this, Mai like the rest of the dolls were given the task to kill their partner to be able to live. She’s the first person to take up this task, stabbing Q-taro in the back and smiling as she does so. It’s later suspected that all the dolls were awaiting the perfect moment to kill their partners, which can be backed up as Mai was often seen close to Q-taro during the investigative periods.

In her first trial, Mai is shown to be panicked to the point of sobbing, and unable to make a decision, decided to go with random choice to decide her fate.

After her death, Mai's AI was uploaded into a doll that looked identical to her in order for her to help the Death Game participants during the third chapter. She was paired with Q-taro as his support. 

Mai, only being a dummy only has some goals. To live, you must murder your master before the Floor Master, Midori dies. Mai took this opportunity to talk to Q-Taro in the Graveyard, after everyone went off to finally track down Midori. Mai stabbed Q-Taro in the back with the knife from the Boxing Ring mini-game earlier in the chapter. Mai cheerfully celebrates, explaining to Q-Taro the plan. Which convinces him to only knock her out, feeling bad for her situation as a support. Mai would always flirt with Q-Taro, mainly to get his trust, and to be ignored more easily. It's unclear if Mai actually wanted to be friends with Q-Taro since she gets knocked unconscious.