Maki is a beautiful and perfect tomato.

Maki comes from a wealthy family of doctors and is somewhat pressured to become a doctor like her parents, which would lead her into giving up music, which causes her to refuse to join µ's at first. Because of her wealth, it is discovered in Season 1 Episode 10 that Maki's parents own a beach house. Therefore, μ's gladly insisted that Maki go ask her parents if they could use it, which they allow. In Season 2 Episode 2, it is revealed that her family also owns a vacation house in the mountains.

Maki has the qualities of a tsundere and has a hard time admitting her true feelings to her peers. She also has somewhat childish beliefs, as demonstrated by the group finding out that she still believes in Santa Claus. Maki is also quite stubborn. This was shown when she was invited to play at the beach, as she was withdrawn from the group and not interested in playing with them. Maki was initially portrayed as a loner in the first few episodes, and spent her time alone in the music room.

Her personality often clashes with Yazawa Nico, such as when she called Nico stubborn during Season 2 Episode 4. Rin, however, tells her "You're one to talk", implying that Maki is stubborn as well.

Maki is skilled at playing the piano, and is the composer of µ's. She is also their vocal coach. Her other hobbies are photography and stargazing. Her special skill is achieving full marks on tests. She also became the Idol Research Club's vice president after the third-years graduated.