Demon King

The Demon King is a designation to a Demon currently wearing the Demon Crown. A Demon King is an all-powerful Demon that has absolute control over Negative Tao and its flow in all aspects. Each Demon King is able to fully manipulate Negative Tao, shown by Nox creating physical weapons with Negative Tao such as Longinus.

First Demon King Akuma-Ara
Akuma-Ara was the first wearer of the Demon Crown

Third/Fifth Demon King Nox
Nox was by far the strongest of any Demon King, as he was able to fully utilize the power of the Demon Crown and almost become a God himself. Nox became the Demon King on two separate occasions. First when he defeated Namix Akiyama in battle, and again when he rejoined with A.U. Nox.

Fourth Demon King Dante
Dante