Kirishima Reiko

Reiko was Yuko's best friend for a while, until Yuko left to become a Valis warrior. Reiko ended up getting gang raped and was forced by the villain Rogles to take up an evil Valis sword and fight Yuko to the death. Additionally, she was raped so hard that she grew a penis and has both sets of genitals for a good portion of the story.