He is a Pillar General of Behemoth's 34 Pillar Division.

Like other demons, Graphel is shown to be very proud and overconfident. He underestimates the strength of humans and weaker demons and doesn't care about insulting them. But he accepts the superiority of Nāga's strength. He is very loyal to En and ready to sacrifice himself in order to defeat Oga.

(Source: Beelzebub Wikia)