Alpha. Unmated. 1st year high schooler. Catchphrases: "This is exhilarating," "Ten billion percent," "Kukuku." Close friends with Ryusui, Chrome, Gen, and Ukyo. A science lover and Japan's genius scientist.

Omega. 2nd year high schooler. Active as a mentalist and magician. Uses slang like "Bayer" (terrible), "Zeemer" (seriously), "Goisu" (amazing), "Reemu" (impossible). Close friends with Senku, Ryusui, Chrome, and Ukyo.

Alpha. 2nd year high schooler, Gen's classmate. Scion of the Nanami Conglomerate and extremely wealthy. Catchphrases: "I want it!", "Ha-ha!", "Hmph." Close friends with Senku, Gen, Chrome, and Ukyo. The world's most covetous man.

Omega. 3rd year high schooler. No specific catchphrase, but has a gentle, caring personality. Close friends with Senku, Gen, Chrome, and Ryusui. Has incredible hearing and is kind and considerate to everyone.

Beta. 1st year high schooler. Catchphrases: "Badass!", "This is exhilarating!" A self-proclaimed scientist. Close friends with Senku, Gen, Ryusui, and Ukyo.

Alpha. The strongest high school primate. Personally close with Senku.

Alpha. A high schooler proficient in Owari Kan-ryu spearmanship. Catchphrase: "You're doing things properly." He prefers people who are "proper."

Omega. Finds the Omegaverse in this world fascinating and perfect for research, despite being an Omega himself. Shares a scientific bond with Senku and talks with Chrome, Gen, Ukyo, and Ryusui. Sworn loyalty with Stanley. Catchphrase: "Elegant." A genius American scientist.

Alpha. An American soldier. His devotion to Xeno is immense; he never forgives anyone who hurts Xeno. He can't imagine mating with anyone but Xeno. Likes cigarettes second only to Xeno. Catchphrase: "You're capable."

Alpha. Ryusui's older brother. Unlike Ryusui, he is introverted. He used to be uncomfortable with the covetous Ryusui, but as the story progressed, they became normal, close brothers. A genius programmer and mathematician who loves games and coding.