Hades

Hades is the God of the Greek Realm of the Dead. The main antagonist of Volume 11 and Volume 12, aiding Khaos Brigade's Old Satan Faction and Hero Faction behind the scenes in a scheme to destroy the Devils and Fallen Angels. He commands a legion of Grim Reapers.

Appearance
Having at least lived for 10,000 years, Hades has the appearance of a skeleton whose body consists of only bones that gives off a creepy aura, and he's dressed in an attire worn by high priests.

Personality
Hades despises beings of other mythologies especially Devils and Fallen Angels, believing that they are unnecessary beings, calling them bats (referring to the Devil's wings) and crows (referring to the Fallen Angel's wings). It is important to note that despite his hatred of the other mythologies, he is not an Evil God. His goal is to rid the world of these beings as he calls them an annoyance.

History
One of the Trinity Gods of Olympus, Hades is one of the Gods that have been active since the ancient times, ruling the Greek Realm of the Dead.

The Heroic Oppai Dragon
He appears in Volume 10 as one of the spectators for Rias and Sairaorg's Rating Game, greeting Azazel and the Occult Research Club before the start of the match.

In Volume 11, he unseals Samael which he lends to the Hero Faction. After the battle, he sends his Grim Reapers to attack the Occult Research Club, before calling them to retreat after Shalba Beelzebub captures Leonardo and forcefully activates his Balance Breaker, creating 13 gigantic monsters to attack the Underworld.

In Volume 12, he was confronted by Sirzechs Lucifer and Azazel in order for him not to interfere the crisis that is occurring in the Underworld, in exchange, he demanded that Sirzechs reveal his "true form". It is later stated by Indra that Hades is very displeased about Sirzechs and Azazel's confrontation and sends Cao Cao to the Realm of the Dead to calm him, along with Georg and Leonardo.

Powers & Abilities
Immense Strength: Given his status as one of the Top 10 "Strongest Beings in the World", Hades is immensely powerful and superior to even Zeus, the leader of the Greek Gods and Poseidon, the God of the Sea. Azazel even told his students once to avoid a direct confrontation with Hades.