Diodora Astaroth was the next heir of the Astaroth Clan. He was the son of Lord and Lady Astaroth. He was one of the main antagonists in Volume 6 of the light novels.


He was a gentle-looking, handsome young man with blond hair as depicted in the novel (Dark Green hair in the anime). Diodora also had a big deep scar on his chest from when he injured himself to have Asia heal it as part of his plan to make her a heretic. He usually wears expensive clothing. He also has golden eyes, but they are almost always closed or squinted.


While initially appearing to be a gentle, well-mannered, and charismatic young man, Diodora was in fact a narcissistic, sinister, vile, callous, and wicked person who would do "whatever it takes" to achieve his desires. He had an utter obsession with nuns and holy-maidens, which was exemplified by the fact that all of his servants were once nuns and maidens that he had acquired after "breaking" them. He enjoyed seeing them with expressions of pain, sadness, and despair which he found to be an ultimate form of entertainment. This showed Diodora to be an incredibly sadistic Devil.

He was shown to have a loathing towards Dragons and those connected to them: he once called Issei a "filthy dragon". After being defeated by Issei, he became immensely fearful of him and dragons as well.

He was also very imprudent, for example when he used the Ophis's power in a careless way as opposed to that of the Devils superiors like Sirzechs, who distrusted his increase in power. Despite this, he is very intelligent, deceptive, and manipulative, capable of manipulating others into doing his bidding. Case in point, with his servants, as well as Asia, where he pretended to fall in love with her only use her for his own twisted love for despair, showing that he is also incapable of love.


It was stated by Freed Sellzen that due to his nun fetish, he had preyed on famous nuns and Holy-maidens in various countries around the human world. He would seduce the maidens with his passionate words in order to make them fall in love with him. After the nuns and maidens were cast out by their churches, which left them devastated, he would appear before to supposedly save them from the depths of their despair, only to eventually be taken advantage of; rape and mentally break them in both body and heart. Diodora would then reincarnate them as his servants who slavishly pledged their loyalty to him.

Sometime prior to the series, when he set his sights on his next target, Diodora purposely injured himself and appeared before Asia, who healed him. This act of healing a Devil resulted in Asia's eventual excommunication from the Church. He was also present when Raynare stole Asia's Sacred Gear, intending to kill Raynare, save Asia, and then take her as his servant. This plan failed when Issei defeated Raynare and Rias revived Asia instead.

Sometime before the series began, Diodora made an alliance with the Khaos Brigade, receiving one of Ophis' serpent to acquire great power. He used this power boost to murder the next head of the Glasya-Labolas clan, something all thought was an accident.


Birth of the Breast Dragon EmperorEdit

He appeared in Volume 5 as one of the six young Devils at the Young Devil Gathering, Diodora had a Rating Game against Seekvaira Agares where he won (although he was secretly using Ophis' snake to help him win). At the end of the same volume, he reappeared in front of the Gremory group, revealing that he was the Devil that Asia healed years previously and proposed to her.

High school dxd v6 83

Diodora slapped by Asia

In Volume 6, Diodora constantly continues to pursue Asia by sending her love letters to no avail. He later comes to the Occult Research Club room asking Rias to trade Asia with one of his Bishops but is rejected, Diodora then attempts to flirt with Asia, promising to still obtain her, this action angers Issei as he pulls him away from her. Annoyed at Issei, Diodora calls him "filthy dragon" which causes Asia to slap him, before he leaves, Diodora declares he will defeat Issei in their next Rating Game and win Asia over.

However his scheduled Rating Game against the Gremory Team did not happen after he revealed himself to be an ally of the Khaos Brigade and kidnapped Asia, while leaving his peerage and the Old Satan Faction to handle the Gremory group. When Issei and the rest caught up with Diodora, he revealed he had Asia heal him in the past simply to add her to his collection of nuns. He was defeated by Issei in a one-on-one fight with Issei overpowering him out of anger at what he did to Asia. After his defeat, Shalba Beelzebub appeared. Diodora begged him for help, only for Shalba to stab him with a weapon of light, and his body dissolved away.

Powers & AbilitiesEdit

Demonic Powers: Diodora showed some skill in using his demonic powers, as he was able to hurl conjured blades at Issei and create barriers during their fight. His power was greatly enhanced with Ophis' snake, surpassing Rias Gremory's demonic power while enhanced with Ophis' snake.

  • Hypnosis: In the anime, he used a form of hypnotism on his peerage to suppress their shame and embarrassment to fight against Issei's Dress Break spell.




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