Emma Sano was Shinichiro Sano (Mikey’s brother) and Mikey's half-sister. Emma has a very childish demeanor when around Ken, her longtime crush. She will often flirt with others to try to get him jealous and then deflate when he doesn't get angry, hoping to steal his attention from her brother. She acts older than she is because she wishes to grow up faster but her childish nature comes out still. She is loyal to her brother and listens to his orders.