Zeon is the demon king who was once trapped in hell for thouesnds of years, he feasted and ate demons till he was the strongest and ruled hell till he created a portal to head back to the human world , which people didn't like him but he still found loyal people and formed the dark moon guild which he leads. He isn't evil but he isn't afraid to kill if it comes to it , he has a pretty carefree personality for a demon king and is loyal to his guild members