Diodora Astaroth

Diodora Astaroth is the supposed heir of the Astaroth Clan after his older brother Ajuka took the title of Beelzebub. He is the main antagonist in Volume 6 of the light novels.

Appearance
A gentle-looking, handsome young man with blonde hair. He is usually dressed in a normal noble clothings.

Personality
While initially appearing to be a gentle young man, Diodora is in fact an evil and twisted person. He has a nun fetish and all of his servants are nuns and maidens that he acquired from all over the world after "breaking" them.

History
In the past, Diodora purposely injured himself to force the kind Asia to heal him, a Devil, which resulted in Asia's accusation of her being a heretic which led to her excommunication from the Church. He was also at the abandoned church at Issei's town when Raynare stole Asia's Sacred Gear, initially intending to be the one to kill Raynare and save Asia and then take her as his servant. His plan, however, didn't work due to Issei defeating Raynare.

Birth of the Breast Dragon Emperor
He appears in Volume 5 as one of the six young Devils for the Young Devil Gathering. At the end of the same volume, he reappears in front of the Gremory Team and proposed to Asia after he reveals that he was the Devil Asia healed years ago.

In Volume 6, he was scheduled to have a Rating Game against the Gremory Team but this did not happen after he revealed that he is an ally of the Khaos Brigade. He also reveals he had Asia heal him simply to add her to his collection of nuns. Diodora then kidnaps Asia and has his peerage deal with the Gremory Team. He was defeated by Issei in a one-on-one fight with Issei overpowering him out of rage on what he did to Asia. After his defeat, Shalba Beelzebub appeared. Diodora pleaded with him to help, only for Shalba to stab him with a weapon of light, and his body dissolved away.

Powers & Abilities
Diodora had at least moderate demonic powers, but was suggested to be the weakest of those related to the current Satans. However, he did show some skills wielding it, even hurling conjured blades at Issei during their fight.