Tiamat is a female Dragon and the only female among the Five Great Dragon Kings. She is a Blue Dragon known as the Chaos Karma Dragon, and is one of the few active Dragons in the series.[1]


In her normal dragon form, Tiamat has the appearance of a pale blue Western Dragon with celestial blue scales.

In her human form, she has the appearance of a beautiful woman with straight and long beautiful pale blue hair, dark blue eyes, and a cold atmosphere that radiates from her beauty. She possesses an extremely powerful dragon aura within her body. She also wears a navy blue skirt, and her entire body is doused with the color of deep blue.


Not much is known about her personality, besides the fact that she hates Ddraig for borrowing her treasure, which was destroyed into several pieces and scattered.[1]She also shifts the blame onto the possessor of the Boosted Gear, Issei Hyoudou, saying they need to take responsibility for her treasure or she will burn them to death. Despite her anger towards Ddraig, Tiamat was very calm towards her meeting with Ddraig. She can also be mischievous as she came up with the idea that since Ddraig was unable to retrieve her lost treasure, Issei needs to take Ddraig‘s place in retrieving her lost treasure.


One of the Five Great Dragon Kings, Tiamat is one of the few legendary Dragons that are still active since ancient times. She is known to be rampaging around the world occasionally.[2] Before the Great War, Ddraig had borrowed Tiamat's treasure for his upcoming battle with Albion. After Ddraig and Albion were killed, her treasures were stolen by human thieves and scattered around the world. Since then she has been chasing after Ddraig and his possessors for a long time in order to retrieve her stolen treasure. At some point, she became a referee for Rating Games out of a debt toward Ajuka Beelzebub, interfering in the event of unusual circumstances like the retirement system failing.


The Red Dragon Emperor's AwakeningEdit

While Tiamat had yet to appear in the series at this time, she was mentioned in the side story "The Familiar's Requirements", by the Familiar Master as a candidate for a powerful Familiar.

Birth of the Breast Dragon EmperorEdit

Ddraig also mentioned her in Volume 4, when he was explaining about the Five Dragon Kings to Issei, telling Issei that she hates him.

The Legend of Oppai Dragon and his Lively CompanionsEdit

She was mentioned once again when Issei and Azazel were talking about the Evil Dragons. During the conversation, Tiamat was said to be the strongest among the Five Great Dragon Kings and has blended in well with the current world and is living in it as she likes[3].

Tiamat made her first official appearance in Volume 19. She appeared in the Rating Game between Diehauser Belial and Riser Phenex after the retiring system didn't work on Riser and Ravel. It was revealed that Tiamat acts as the secret judge/administrator for the Rating Games and only appears when something unexpected or malicious things happen. She does this as she is indebted to the Maou Ajuka Beelzebub and has appeared only twice in the past to resolve things for the games.

At the end of Volume 20, Tiamat accompanied Ajuka who was conversing with Shiva about Trihexa's reincarnation. She then shows Shiva a blue mobile phone noticing that it was related to a Longinus.

Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh AcademyEdit

She returns in Volume 23 along with Ouryuu Nakiri and Millarca Vordenburg at the Occult Research Club and demands that Ddraig give her back her treasure that he stole. She says that if it were possible, she would ask Issei to let her join his team but is unable due to her being part of the Rating Game’s management, but she will allow Ouryuu to join the team. She then leaves Ouryuu in Issei’s hands and gives a warning to Ddraig if he runs away again like he always did, she will burn him along with his possessor, Issei.

Powers & AbilitiesEdit

Immense Strength: The strongest of all the Dragon Kings.[1] According to the Familiar Master, she has Satan-level powers. Tiamat's anger is strong enough to make Ddraig, a Heavenly Dragon, to cower in fear.

Fire Breath: As with many other Dragons, Tiamat has the ability to breathe fire.

Shapeshifting: Tiamat has the ability to shapeshift from her Dragon form into a human form.

Stealth Expert: Tiamat is very skilled in hiding her presence, as even Ddraig was unable to detect her.

Flight: Like most dragons, Tiamat is capable of flying.


  • Tiamat's name is derived from the Babylonian sea goddess Tiamat. Also, Tiamat's title, the Chaos Karma Dragon, is derived from the fact that the mythological Tiamat is a chaos monster.
  • Tiamat is the first female Dragon to appear in the series, not counting Ophis since she is genderless.
  • Tiamat originally wanted to join Team Red Dragon Emperor of the Blazing Truth, but was unable due to her being part of the Rating Game’s management.


  1. 1.0 1.1 1.2 Highschool DxD Light Novel Volume 4 Life 5 Part 2
  2. Ishibumi's blog
  3. Highschool DxD Light Novel Volume 14 Life 2 Part 6


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