Male. The Demon King. Unquestionably the strongest being in the world. He has fought hundreds of heroes. He has zero interest in world conquest. While searching for a worthy rival, he became the only demon to become a hardcore fan of human pop culture, like anime and manga. His favorite genre is pure romance. He has absorbed the Abyss. Despite his appearance, he cracks jokes and can be a bit of a klutz. However, he gets seriously angry if Dominic is threatened or ignored. He sends demons to create dramatic situations for Troy and Riley or to help them grow, and he even transforms into a human himself to assist in their training. Of course, his transformation is so perfect that Troy and Riley can never see through it. When transformed, he uses excuses like being Blay's colleague or friend. If something interesting happens, he has Dominic broadcast it remotely while he eats popcorn. He can manipulate Ki.

Male. Features turquoise hair, red eyes, and a horn above his left eyebrow. He is Krad's secretary and the one who gets nagged by Krad the most. He is fundamentally versatile and powerful, but his strength is overshadowed because the people around him are so overwhelmingly strong. Even when angry, he always uses polite speech and only swears internally. He can manipulate Ki.

Female. A Hero. Long straight white hair and purple eyes. She has the face of a classic 'cool beauty.' She possesses incredible talent. She can manipulate Ki. She was taken in by Blay as a child and became her disciple. Everyone around her knows she has a crush on Troy, but Troy is the only one who hasn't noticed. She is still training in the village and has not yet begun the journey to the Demon King's castle. She cannot see through Krad or Dominic's transformations.

Male. A Hero. Short black hair and black eyes. A pure hard worker. He truly loves training. He is fundamentally trusting of others. He was taken in by Blay as a child and became her disciple. He knows how to manipulate Ki. He is unaware that Riley has a crush on him. He is still training in the village and has not yet begun the journey to the Demon King's castle. He cannot see through Krad or Dominic's transformations.

Female. Gray-brown hair and red eyes. A retired Hero. She was strong enough to be Krad's rival, but is currently weakened due to injuries sustained in battle. Even so, she remains powerful. She took in the young Troy and Riley and raised them as her disciples. She can manipulate Ki. She is the only person capable of seeing through Krad and Dominic's transformations.