Stella Watson operates as a member of the Buddy Police organization. British by nationality, she was raised in Kyoto, Japan, a cultural blend occasionally reflected in her speech within the Japanese version of the series through the use of Kyoto dialect. She possesses blonde hair styled in a bun, with several strands falling to her right shoulder. Her eyes are turquoise-blue, and she wears glasses. Her typical outfit consists of a green vest worn over a white-grey shirt, paired with a matching white-grey skirt and black high heels. Personality-wise, Stella demonstrates confidence and maintains a calm demeanor. She values forming new friendships and exhibits strong loyalty to the Buddy Police, actively performing various tasks to support their operations.