Mutsumi Mochida, often called Mu-chan, is a supporting character in Jewelpet Happiness. She is a middle school student at Jewel Academy, where she shares a room with Marie and Nobara. She has short black hair with a pink hairclip decorated with a candy charm, and she is easily recognized by her calm and somewhat fussy demeanor. Mutsumi is notably laid-back in her approach to daily life, yet she also displays a fussy side, paying close attention to details and preferences. Despite this, she is a very supportive friend, especially toward her roommate Marie, whom she encourages and stands by. Her primary motivation is to help those around her, and she often does so in a quiet, unassuming way. She has a fondness for sweets, with honey caramels being her favorite food. Mutsumi is also the human partner of the Jewelpets Charotte and Aqua, which gives her a connection to the magical elements of the story. Within the series, she does not undergo major dramatic change; instead, she serves as a steady, reliable presence among the supporting cast, providing friendship and a sense of normalcy. Her notable abilities lie not in magic or combat, but in her loyalty and her knack for offering practical emotional support to her peers.