Ishiki Erishi is a Ra Yellow student. He is seen in the anime, with America Uchimura, as a spectator to Jaden Yuki and Dimitri's Duel.
He is also seen being beaten by Chazz Princeton along with America Uchimura and another Ra Yellow member when Chazz is in the Society of Light.
In the 3rd season, he was one of many students who were transported in second alternate dimension and became a Duel Ghoul.
Ishiki appears in the game Yu-Gi-Oh! GX Spirit Caller, as a duelable opponent.