A student of Saint Ishiyama Academy as well as a member of the Six Knights. He also happens to know Oga and Furuichi from middle school.
He is a former friend of Oga and Furuichi since middle school. It is still unknown how close he is to Oga and Furuichi.
Miki Hisaya is created by Ryohei Tamura, and he has no information regarding any inspiration used to create him. His Japanese voice actor is Nobuhiko Okamoto. He first appears in Beelzebub volume 6 and episode 29.