A human with a large dream, but no substance to realize his dream. His need to prove himself might have stemmed from being overshadowed by his younger brother, who has a steady job and lead a peaceful life. Binerphegor imprisoned Yuemia with the help of his aide, Mishaguji, and an ancient spell once used by Seimei.

Binerphegor's name and behavior was inspired from Belphegor from Shin Megami Tensei.