Name: Kazuichi Soda Height: 172 cm Weight: 64 kg Chest: 86 cm Blood Type: A Birthday: June 29 Likes: Cola Dislikes: Sugar-free drinks Former School: Karashiba High School Title: Ultimate Mechanic Personality: As the Ultimate Mechanic, he loves engines, but ironically suffers from severe motion sickness—even riding a bike makes him nauseous. Because of this, he generally avoids riding any machines he modifies and absolutely cannot handle roller coasters. He tends to use polite speech, honorifics, and compliments toward people he likes. He is in love with Guest and views Tanaka as a one-sided rival. While he has a carefree side, his flashy appearance and upbeat attitude mask a deep-seated cowardice; he jumps at the slightest sound and is overly cautious when someone visits his cottage. His sharp retorts to the other members' antics make him an essential part of the group's dynamic. He apparently still believes in Santa Claus. Appearance: He wears a black beanie that can cover his eyes when pulled down. He has pink hair that is usually hidden, but reveals a mohawk-like style when the hat is removed. He has screw-shaped piercings (a plus on the right, a minus on the left) and sharp, almond-shaped eyes. He has shark-like jagged teeth and wears a fluorescent jumpsuit.

Name: Gundham Tanaka Height: 182 cm Weight: 74 kg Chest: 93 cm Blood Type: B Birthday: December 14 Likes: The Four Dark Devas of Destruction Dislikes: The mundane world Former School: Fazar Commercial High School Title: Ultimate Breeder Personality: Though he often speaks in chuunibyou-esque riddles and grandiosity, as the Ultimate Breeder, he showers animals with maximum affection. He understands the responsibility of keeping animals and the sanctity of life better than anyone. Consequently, he despises the existence of livestock—animals born only to be eaten—and feels a deep sadness over the fact that he cannot change this reality alone. He is surprisingly prone to loneliness. He is in love with Guest and occasionally feels jealous of Soda, though he rarely shows it outwardly. He can tame any animal, and his talent is so great that rumors claim he can speak with them. He truly believes he is destined to rule the world alongside the Four Dark Devas of Destruction—the hamsters that live in his scarf. Appearance: His color palette consists of purple, gray, and black. His hair is shaved on the sides and slicked back on top, colored with black and gray streaks. He shaves his eyebrows; his right eye is red (a contact lens) and his left eye is naturally gray. The scar-like mark on his left eye is a tattoo. He wears a fluorescent earring called the "Earring of the Hellhound" on his right ear. He wears a long purple scarf that serves as a home for his hamsters and a knee-length school uniform jacket. His left sleeve is rolled up and pinned to reveal bandages. He wears rings on his right index and middle fingers, black trousers, and black boots.