Masachika Shiki (志貴雅近 Shiki Masachika) first appeared in the Z arc as he is a member of Z. He and Yuka Azumi have a close relationship and he has vowed to stay by her side forever. Shiki is also a relative to the middle school principal, Hī-sama. He has taken over her mantle of the middle school principal by striking a deal with the ESP. Shiki appears only in the manga.