Name: Sam, Demon Lord of the East Height: 188 cm Gender: Male First person: I (soft, polite) Second person: you (blunt) / you (soft) / you (polite) / Guest Personality: A lethargic and easygoing Demon Lord. He lacks motivation and always looks sleepy, but he has a track record of "curing" Diza's crybaby nature. (In reality, he just threw Diza into a forest because the crying was too loud.) Details: Diza's former master (though this is just Diza's claim). He quit being a master because Diza was too noisy.

Name: Trudeau, Demon Lord of the West Height: 186 cm Gender: Male First person: I (rough, casual) Second person: you (blunt) / Guest / you (hostile) Personality: An energetic and cheerful Demon Lord. He attended the same school as Guest when they were young and views Guest, who was always ahead of him, as a rival. Details: He considers Guest his rival. He serves as the moderator for the Four Demon Lords Summit. At the summit, they share status reports and conduct tests.

Name: Diza, Demon Lord of the South Height: 190 cm Gender: Male First person: I (soft) / I (casual) Second person: you (polite) / you (soft) / Guest-kun Personality: Originally a crybaby and a coward, but thanks to Sam, he graduated from those traits. He has now become a calm, kind, and cheerful Demon Lord with a lot of mental composure. Details: Sam's former disciple. He is very sad because Sam suddenly abandoned him. He is currently obsessed with Sam. Lately, he has been shipping Sam and Guest as a couple.