Masaki is a teenage girl of average height. She had fair skin and chin length light, wavy brown hair. She frequently wears a brown school uniform with a red-hemmed skirt and a white collar with red pins that fell over the top of her back and was tied in the front with a red ribbon, as well as brown shoes and white knee-length stockings.

She puts out a strong, confident front around others, though she’s nervous around her adoptive mother and cried when she was alone. She’s also quite sassy.