Demon King

The Demon King (魔王, Maō) or King of Demons (魔族の王, Mazoku no Ō) is the title given to the leader of all demons.

Overview
The Demon King is the ruler of the Demon Nation and the strongest of them all. For the demons, they are the one responsible to give prosperity to the nation, but for the humans their existence is the greatest threat to the mankind. Most of the Demon Kings have a tendency to become violent and blood-thirsty with the time, starting wars.

Selection
Similar to the heroes' mark, one candidate per every one of the 20 demon tribes receives a mark that indicates that they are able to become the next Demon King. If the current Demon King dies, then one of the candidates is automatically chosen and their mark changes into the mark of the Demon King.

Powers

 * Dark Energy Control
 * Demon Race Subordination

Known Demon Kings

 * Eve Reese (original timeline, Current Timeline: unknown)
 * Hakuou (original timeline: predecessor of Eve, current timeline: in position)
 * Kokuyoku Demon King (predecessor of Hakuou)