Seiji Midou
御堂成児, 御堂晴爾
Gender:Male
Kouheis cousin and a powerful exorcist in his own right. Later in the series it is revealed that despite training his entire life his powers are no match for Kouheis latent potential. Because of this he is slightly jealous of Kouhei. Seiji Mido same reading is his writers name.
Source: Wikipedia edited
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