Also known as: 鈴木入間, 入間くん
The titular character of Mairimashita! Iruma-Kun, and the only human. He was sold by his exceptionally irresponsible parents to the demon Sullivan (Iruma-Kun), who adopted him as his grandson and enrolled him in Babyls, a prestigious school for demons.
Iruma has Blue Hair that became slightly more purple during his Evil Cycle arc. The latter appearance can be tagged Dark Persona.