Diablo

He desired to be reborn as a demon lord, and to serve a beautiful master.

Appearance
As an archdemon he was a beauty whose gender was indeterminable.

Background
By offering the corpses of the Blood Shadows and the 15000 human soldiers, Rimuru summoned an archdemon and his two greater demon subordinates. Using the corpses they were successfully able to materialize. He ordered them to capture the the three escaping Blood Shadows, and bring them to Ranga.

The secret revival art was lacking the necessary energy. so the archdemon offered his two subordinates. They were delighted to be of use to Rimuru. Hence, when Rimuru awaked he was grateful and allowed the archdemon to become one of his comrades. When Rimuru found out he didn’t have a name he named him Diablo. And told him to become his guardian deity. A black cocoon enveloped his body creating a perfect evolution posture.

Abilities
He can calmly use spatial transfer.