Estimated to be a little over 18 million years old, Diablous is the latest in a line of dark lords ruling over the kingdom of Hell. She possesses a human vessel appearing as a young lady between the age of 20 and 25, with pale white skin, long brown hair, crimson eyes and a fanged mouth. Her face is covered by a leather hood that leaves the face covered in unnatural darkness, with only the eyes and mouth visible. Diablous is smug and abrasive, but can be surprisingly gentle with close friends.