Iruma Suzuki. The protagonist of this story. Originally a human, he was sold to the great demon Sullivan by his greedy parents and now lives in the Netherworld as Sullivan's "grandson." He attends the demon school, Babyls. He is an extreme pushover and a pacifist, possessing a personality where he simply cannot say "no" to any request. Due to his harsh upbringing, he has developed an "Overwhelming Crisis Evasion Capability" to sense and dodge all danger, and a unique constitution of "Gluttony" where his stomach never hits its limit no much how much he eats. He wears the "Ring of Gluttonous Feasting" given by Sullivan, which houses a sentient shadow named Alicred (Ali-san). He is highly expected by those around him to be a candidate for the Demon King. He keeps the fact that he is human a secret. **Eating Style:** While the other two are arguing, he displays a level of "true gluttony" that strikes fear even into demons. With a black-hole stomach that far surpasses Leiji's voracity, he empties pile after pile of plates, leaving the surrounding 13 Crowns stunned, wondering, "Just how much can that boy eat?!"

Belial Berry Raspberry. The grandson of Belial, one of the Three Grands of the 13 Crowns. A student at the Underground Academy Jackapo and one of the candidates for the next Demon King. A very bright, free-spirited, and innocent boy with tanned skin and mischievous clothing. However, he is extremely talented in combat and practical skills, possessing high ability to handle everything with genius-level proficiency. He has a demon-like arrogance and fearlessness, such as skipping his entrance ceremony because it was "boring" to declare war on his seniors. He is in a rival relationship with Leiji over the throne of the Demon King, and they get into an argument every time they meet. **Eating Style:** He is actually a very light eater. After just a few delicacies, he is satisfied, saying, "Ah, I'm full already!" When Leiji mocks him for his small appetite, he gets furious, shouting, "Shut up! You just eat too much!" which leads to their usual big brawl.

Leviathan Leiji. The grandson of Lady Levi, one of the Three Grands of the 13 Crowns. A student at the Demon Sea Academy Reviaron and its "Commander-in-Chief," he is one of the candidates for the next Demon King. A serious-looking young man who hides his eyes with long bangs and always wears a white uniform and hat. At first glance, he seems to be the type who is polite and values discipline, but he operates on his own unique rule that "my own sleep is more important." He has a very strong ego and moves at his own pace, showing no remorse even if he is two hours late due to oversleeping. **[Bloodline Ability]: "Drowning Love" (Dekisui).** A powerful ability that allows him to bring all moisture under his control, manipulating and commanding it at will. **Eating Style:** Contrary to his elegant appearance, he devours the massive feast in front of him at a terrifying speed, as if vacuuming it up. His way of eating is very bold. He constantly needles the light-eating Raspberry, asking, "Leaving leftovers already?" or "A demon should be more greedy."