Neil Bowman[]
Neil Bowman is the Demon King's host. The Demon King relies on Neil, who is able to absorb all of his negative energy. This allows the Demon King to sleep peacefully inside of Neil's mind's eye.
Lily Angel[]
Lily Angel is a battle angel sent to kill the Demon King. As said by the Demon King himself in episode 24, "'She's born to be my nemesis.". Lily attempts to attack him while in his "Neil Form", trying to bring the demon back to his normal, unpossessed self.
Nick Hoult[]
Nick attempts to steal the Demon King's power by using a pink, cartoonish wand that is shaped like a heart. He absorbs the power, but cannot stand the negative energy and voices that take over him. The power overcomes him, and returns to Neil's body.
Damao[]
Damao was originally sent to find and watch over the Demon King as well as to study what he does. Later on, he abandons this role after becoming friends with Neil.