Yoyoko has brown hair tied in pigtails and light red eyes. She wears a beret and a black choker.

Yoyoko, despite her external angry, stoic appearance, has been very insecure and has a lousy communication style that always makes people hard to deal with her. While she already gained fame since being in SIDEROS that she can perform her own solo live, she still compares other people's achievements against her, feeling that she didn't do enough to surpass them.