Noragami

The Ashura (阿修羅, "Antigod") are that have rebelled against the divine foundation that composes the world in which they reside. As the is the deity acknowledged as the lord over, it is therefore understood that the Ashura are souls that have refused to serve the King; including  themselves that have turned on the King of Souls, such as the infamous. Because of this, the Gotei 13 view them as the greatest threat. L'Obscurité is an organization that is led primarily by Ashura.

Behind the Scenes
Rather obvious, the Ashura are inspired by the Asura in Buddhist belief.