Otsukin: An extremely dangerous scientist Numa who has mastered pharmacology and handles toxic substances. His patience is non-existent; he explodes at the slightest provocation. The moment his emotions heighten, his reason evaporates, and he turns into a total thug. He reportedly graduated with Kooritora and is shown to be acquainted with the headmaster of Fuwansowa Academy in the story. He is said to be the top graduate of the Pharmacology Department at Fuwansowa Academy. His weapon is a flask. Speech Style: Take this! I won't let you off easy! , Just as calculated... you bastard! , Now, I'll crush you!! , Blow them away! Don't be a wimp!!

Kooritora: A skilled engineer capable of building robots and communication devices. He loves ramen so abnormally that his meals consist of nothing else. The moment he eats anything other than ramen, the life drains from his face. He is sometimes called Hyoko. His weapon is chopsticks. Speech Style: Enjoy your meal~ , This is just an output test. , This is a man's masterpiece! , This is going too far... , You'll be in big trouble if you underestimate me.

Axiz: A musician and composer Numa who is always drinking. His house has long since turned into a hideout for other Numas, and the roof disappears twice a week. An extreme shut-in and gloomy type, he rarely shows up for any appointments. He mostly lives in the attic. He is the worst at cooking among the Numas and is a glass-hearted crybaby. His weapon is a warhammer. Speech Style: What do I do about this, what do I do... , It's dangerous! , I'm not feeling well. I'm not cooperating.

Uyie: A top-tier maestro who is secretly a famous mystery novelist. He dedicates his daily life to exploring stimulation through an obsession with eroticism and panties. On boring days, he browses underwear stores and enjoys sketching other people's laundry. The villain of Part 3. He reportedly changes the panties he wears on his head every day depending on his mood. His weapon is a fountain pen. Speech Style: I won't let you touch me. , Introduction, development, turn, and conclusion. It's the basic of basics. , I don't really want to draw this, but... how tiring. Shall I redraw it? , Was this your territory? Excuse me for a moment.