Yūsaki Riko

Riko Yuusaki is Rito's female alter-ego, who is accidentally created through Rito being transformed into a girl by one of Lala's bizarre inventions. Later, Saruyama,  Rito's best friend  falls in love with "Riko-chan" and asks Lala to invite her for a date; out of pity, she forcefully changes Rito into "Riko" so Saruyama can go on a date with Riko. After that Riko only appears for short amount of times at rare occasions. While as Riko, it is often stated that she is Rito's, and Mikan's cousin to avoid suspicion. By turning into Riko, Rito has a slight understanding of what Run and Ren go throught when changing.

Appearance
Riko greatly similer to Rito as some characters have noticed, she has gold brown eyes and has slightly long straight hair and it's less spiky then Rito's. She is a beautiful girl (with a physical appearance resembling a tomboy) who gets much attention from men, such as Taizou Motemitsu, the  principal  and even  Kenichi Saruyama. Not only is  Riko quite attractive to a lot of boys, her looks are even appealing to girls like how she has a great bust size which even makes Nana jealous, Haruna apperently finds her cute and Momo even mentioned that Riko is still her type.