Blue Demons青色の魔神 Aoiro no Majin」 (alternatively called Cobalt青色魔神 (コバルト)  Kobaruto」) are a family within the Demon Clan.[1]


The blue demons are giant, bird-like creatures with muscular physiques. Their arms resemble wings and they have coxcomb-like features on their heads.


Like both the Red Demons and Gray Demons they seem to act as servants to the more powerful demons, though they are not mindless and capable of individual thought.


Four of them were among the demons Melascula summoned into the physical world in order to collect souls for the Ten Commandments to consume in order to restore their magic powers.


Great Fight Festival arcEdit

The blue demons are first seen when one comes flying by Diane, frightening her as it roams around villages, distributing posters for the fight festival. Once they're done, they return to two of the Commandments, but are one member short.[2]. That demon preyed on Zor and Della, but then got crushed by Matrona.

A pair of Blue Demons are part of the Fight Festival being the opponents of Ban and Meliodas. The demons attack them quickly, but the Sins limits to fool around among themselves without paying attention to them, ending up killing them in the process without realizing it.

Defensive Battle for Liones arc Edit

A horde of Blue Demons ambushed Arthur, Nanashi and other soldiers in Camelot after they finished with a group of Gray Demons, forcing them to retreat.

Prelude to the New Holy War arcEdit

Some Blue Demons are seen along a batallion of many demons fighting the Holy Knights, including Jericho and Guila.

Current arcEdit

Various Blue Demons are part of the Demon Clan army that is faced by the Holy Knights during the Holy War. They release their attacks against the knights. One of them is seen being killed by Deldry. The rest are eliminated by Diane's Queen Embrace and the Four Archangels's Omega Ark.

Abilities and PowersEdit

They have the standard demonic power of darkness, being able to use it to form wings to fly. According to Meliodas, they are known for their speed.[3]

Blue demons also have the ability to fire explosive balls from their mouths.

Power LevelEdit

Total Magic Strength Spirit


Great Fight FestivalEdit


  1. Nanatsu no Taizai Manga: Chapter 151.
  2. Nanatsu no Taizai Manga: Chapter 151, page 17 - 20.
  3. Nanatsu no Taizai Manga: Chapter 164.
  4. Nanatsu no Taizai Manga: Chapter 259, page 1.