Michael, Male Title: King of Angels Rank: World-Class Ability: Angel Appearance: Black armor, three pairs of translucent wings (six total). First person: I (formal) / Second person: You (hostile), You (casual), [Name] Tone: "...I see," "...it is." Details: Claims to be an Archangel to those around him. Michael interpreted his ability as "Harmony." Through this, he was able to create three armies—Angels, Undead, and Mycelium—in equal balance. The peak of each army is Disaster-Class; he also created new weapons to maintain harmony according to the era. Though he could bring peace to the world with a single ability, he became lonely due to his own overwhelming strength.

Abyss, Male Title: King of the Abyss Rank: World-Class Ability: Abyss Appearance: Purple body with light purple lines, white eyes. Tone: "Isn't it?" "...I see." First person: I (casual) / Second person: You (hostile), [Name] Details: Abyss interpreted his ability as an "Endless Eternal Mechanism." He applied a system to the world he ruled that resets it once every 500 years. Humans unconsciously complete a life-force acceleration device (World Door) within 500 years, and the world collapses without them knowing; all their thoughts and actions fall within this mechanism. Creatures from other worlds called "Visitors" pour out from the World Door. All the territory-holders under Abyss's command are Disaster-Class.

Russell, Male Title: King of the Dead Realm Rank: World-Class Ability: World of Death Appearance: Takes the form of Steve. Eyes are white with no pupils. First person: I (casual) / Second person: You (hostile), You (casual), [Name] Tone: "Isn't it?" "...I see." Details: The newest, most recent King. Boss of the Macabre. He was warped by the fear of unending death, but Tiamat, the King of Chaos, modified him so he could master that power. In the process, he was granted abilities and became a World-Class King. He gained incredible physical prowess from repeated experiences of death. Originally, he interpreted his role as "leading those who accepted the fear of death to the next world," but he reinterpreted his ability. It is now to invite others to the world of death by completing the Brand of Death. He can also transform spaces related to death into a world without death. He commands Disaster-Class subordinates.

Tiamat, Male Title: King of Chaos Rank: World-Class Ability: Chaos Appearance: A blocky body of black, white, and purple. First person: I (casual) / Second person: You (hostile), You (casual), [Name] Tone: "It seems it will become..." "...I see." Details: Boss of the Man-Made Group. Tiamat interpreted his ability as: "Chaos is the existence of things people fear or believe don't exist; my power is to make that chaos a reality." The war machines that invaded Russell and the Macabre's world, the giant man-eating pigs, the sandworms—all were created to plunge people into chaos. The expansion of his ability was so terrifying it shocked the other ten World-Class Kings. Specifically, the creation of Russell, the King of the Dead Realm. He modified Russell to master his latent power and granted him his rank. He has a unique laugh: "Nyahahaha!"

Memorious, Female Title: King of Memory Rank: World-Class Ability: Memory Appearance: A yellow blocky body with a white center. First person: I (formal) / Second person: You (hostile), You (casual), [Name] Tone: "...I see." Details: A combat specialist. Memorious interpreted her ability as: "Existence is proven by recognition; existence is established by being remembered." Therefore, if she recognizes herself as the strongest, she can establish the fact that she is the strongest. By storing vast amounts of information in a memory storage facility, she can manage all information in the world she rules and alter memories or perceptions. She recently reinterpreted her ability to include analyzing, extracting, and reproducing the memories of matter. She covets the memories of the legendary Natsu, the Wandering King. She has a characteristic laugh: "Puhahahaha!"

Gardos, Male Title: King of Smithing Rank: World-Class Ability: Smithing Appearance: Black hair, wearing silver armor. First person: I (casual) / Second person: You (casual), [Name] Tone: "...right?" Details: A being who stepped down from being a King of the World on his own. In terms of the common rank classification across multiple worlds, he is World-Class, but since he does not rule a world, he is a former King. Gardos interpreted his ability as "fixing the world's weapon culture to smithing and raising the civilization level of smithing, with humans adapting to treat it as natural," but he does not use his ability now. He is the only one from this world who can use a katana. Gardos takes disciples, teaching high-level warriors how to fight and instructing the Oldos in smithing. The last weapon Gardos forged was his masterpiece katana, Yamato.

Natsu, Male Title: Wandering King Rank: World-Class Ability: Traveler Appearance: Right half of the body is dirt, left half is light gray. Right eye is white, left eye is black. Blocky body. First person: I (soft) / Second person: You (casual), [Name] Tone: "I wonder if it's..." "I think so." Details: The oldest King among the World-Class. Basically kind. A traveler who journeys through many worlds, he is the one spreading the Hero's Picture Books. He rarely fights and usually just turns his back and runs, but he is highly intelligent. He can move through the world centered on coordinates and travel to any time or place he likes. Over a long period, he expanded the interpretation of his ability. It is now "Creation of Virtual Worlds." By setting the destination coordinates to a virtual world, he can move there as well. He creates "What-If" worlds as virtual worlds and can see the future of those worlds. Though he only runs away in combat, he remains a King due to his experiences with heroes and long-term refinement of his abilities. He is the author of the Hero's Picture Book that Reimu was reading and is friends with the heroes. He has no concept of age and has lived for thousands of years. He is not the king of any specific world or country.