Kuro

Güliedistodiez, also known as Gülie, Kuro, or Black, is a dragon god and the leader of the 9th Demon Army Corps. He in an old acquaintance of the Demon Lord.

Güliedistodiez is a rather quiet and thoughtful man, usually putting other's safety before his own. Nonetheless, his morals are placed high in his priorities list and wouldn't even doubt a second to intervene to protect the mortals of his world.

(Source: Kumo Desu Ga, Nani Ka? Wiki, Official Site)