He has black hair and black eyes and wears the standard uniform. During the winter season he likes to wear a gray striped scarf.
He is a kind and out going person. He seems to have a big respect for Junichi Tachibana often calling him "boss".
He and Junichi are really close that they often meet and talk secretly just to talk and share about there secret treasures.
- The name Masayoshi means "right, proper" (正) (masa) and "lucky, good" (吉) (yoshi).
- Masayoshi's surname Umehara means "Japanese apricot, plum" (梅) (ume) and "field, plain" (原) (hara).