So far, Mai's background has been relatively unknown. However, it is revealed that she is often in conflict with her father. As a result , she went to Brazil around the age of 9 when she couldn't even speak Portuguese. It is hinted that Leonardo Silva took care of her during that time, explaining their close relationship and her Ginga style of soccer. Her complicated relationship with her father may explain her personality and need for attention. She has expressed her desires to be famous and earn a lot of money in order to prove to herself to her father.
Mai has brown eyes and platinum blond hair usually tied up at the back. She made her first appearance in the anime wearing pink shorts and a white tank top. She is noted to be cute and is consider to be idol level along with Mishima Nana in Nadeshiko Japan.
When Mai first appeared, she seems to be a bit childish and spoiled. She wanted Nana's position as below top and attempted to score goals by herself. She became easily depressed when she is unable to score a goal or others taking away the attention. Eventually, her competitive and strong personality became a strong turnoff factors to the other Nadeshiko Japan members. However, after accidentally listening on to Kakeru and Nana's discussion about she is a key factor to Nadeshiko Japan's victory, she began to soften up and blend in with the rest of the members.  While she is still competitive, she now passes the ball to her teammates when needed and cheers other on.
Outside of matches, Mai is very outspoken and bold. More than once, she would tease Kakeru with her advances. Most of the time, she is always seen with a bright smile on her face. Later on, Kakeru noted that it might just be her way of covering up her loneliness after he saw her secretly crying.