『Ruka Urushibara』

Age: 16

Birthday: August 30

Blood type: A

Height: 161 cm

Weight: 44 kg

Second year in Kasensou Private Preparatory Academy, and Mayuri's classmate. Born biologically male. He has the personality of a polite, well-raised and justified kind of beautiful girl.

His biggest wish is to be born again as a female.He eventually gets his wish and sends a text to his mother's pager, telling her to eat more vegetables. This is said to help increase the chances of a child becoming female. Okabe experienced a shift in the world lines and Ruka is successfully changed into a female. This is all undone eventually in order for Rintarou to save Mayuri.