Arthur

Age: 30s
Birthday: December 24th (Capricorn)
Blood Type:O
Favorite Food:Mince pie
Homeworld:Common World (Birthplace)
Sky World (Raised)
Occupation:Leader of the organization Knights of Rounds
Driver:
To bring new order into the three worlds- the Sky World, the Common World and the Demon World had fell into chaos because the opening of the "Divine Gate", within the "World Council", the "Knights of Round" was formed.

Although he was in the Common World, in the past he was thrown away to the Sky World when he was still a child.

Keeping a certain thought about the Divine Gate secret, he is gathering Adapters such as Akane and the rest.

(Source: Divine Gate Wikia)