Selphie is childish, upbeat, and hyperactive, always looking to have fun. She is a fan of combining words to form new ones. Selphie has her own expression: "Booyaka!", used by her on her website as a greeting. She wants to spread the lingo, but fails. In Japanese it is "Mamimumemo!" — which is the "M" row in the Japanese alphabet. Selphie is talented with computers and vehicles, and has many hobbies, ranging from running a website in the Garden intranet to heading the Garden Festival Committee to being obsessed with trains. Selphie has a dark sense of humor, sometimes displaying it in a way others are not comfortable with.