She has short brown hair with black eyes, similar to Sumire Hoshino.
She is tomboyish and has higher skills in baseball than Gian. In front of her grandfather, she is gentle and kind.
Both of them are good friends. Mizue is Nobita's temporary crush, replacing Shizuka in the episode. He was amazed by her skills and wanted to befriend her.
Like Nobita, Gian and Suneo have a crush on Mizue and praise her athletic skills. They try many times to get Mizue's attention but usually fail because of Kaminari.
He is Mizue's grandfather. They have a remarkable relationship.