Maria Satou is a supporting character in the anime series 'Kiss x Sis.' She is a young, cute girl who attends junior high school and is known for her sweet and innocent demeanor. Despite her youthful appearance, Maria is quite mature for her age and often acts as a voice of reason among her peers. She befriends the main characters and becomes a part of their close-knit group. Maria's role in the series is to add a layer of innocence and charm, often bringing a fresh perspective to the comedic and romantic situations that arise.