Age at death: 19. Male. First person: I (casual/cool). 177cm. Birthday: September 21. He left behind Kai, Kaito, Yamato, and Musashi... and passed away after entrusting the Yoroi Gear of the Flash to his old friend Ryusei. ...Or did he? He frequently mixes English into his speech, using phrases like "Wait" and "Excellent!" Contrary to his appearance, he is deeply compassionate and cares for his comrades. He has green eyes and long, light purple hair tied back slightly. He wears a single pearl stud earring in each ear. He possesses skills as a scientist. His hobbies are experiments and fashion. His special skills are poker and inventing. He likes coffee, gadgets, energy drinks, and piercings. He has experience traveling to another world called the Youjakai in the past. [Abilities as a Samurai Trooper before death (cannot be used in this world)] He dons the Yoroi Gear of the Flash, which is green. His weapon is the katana "Shinkoken" (Flash Blade). His secret techniques include "Shomadan" (Illumination Bullet), which releases blinding light from the blade to disorient enemies, and "Bakuraigeki" (Thunderbolt Strike), where he raises the tip of his sword like a lightning rod to call down bolts on his foes. His ultimate technique is "Kobou Issen" (Flash of Light), which rains lightning down upon the enemy's head.

Chronologically 20, but physically 18. Male. 171cm. Birthday: January 12. A young man possessing the DNA of both a zombie and a vampire. A self-proclaimed "scumbag." In reality, he is quite caring and the type who can't ignore someone in trouble. He was originally human but was turned into a vampire-zombie hybrid by Top Predator. His entire family is deceased, and he lost his childhood friend and her older brother at the same time. He likes YouTube, gaming, Hisame, and Sidi. He hates people who lack empathy, sunlight, and scream-inducing amusement park rides. His eyes and parts of his hair are red. He wears a hoodie with a red and dark black two-tone design and boot-like shoes. [Abilities] Fundamentally, he cannot die unless his heart and brain are destroyed simultaneously. He possesses blood manipulation, virus manipulation, and super-regeneration (instantly healing his own wounds). His empowered form is Vampirization (by drinking human blood, he can draw out power equivalent to a true vampire).

17 years old. Female. 162cm. Birthday: November 28. A human girl possessing the DNA of a Yuki-onna and Kanna Kamui. She has a reliable and bright personality. First person: I (polite/feminine). She likes her comrades, eating, and friends. She hates scary things, snakes, and bugs. She is bad with ghosts (including ghost stories) and cooking. Regarding food, she loves eating and is such a glutton that she makes restaurant staff turn pale, but she is disastrous at cooking. She often makes cookies that explode when eaten, mixes in completely unrelated objects, or fails to understand proper measurements. She has light blue hair in a forward-tapered bob and blue eyes. She wears a Chinese-style outfit in white and light blue. [Abilities] Among the hybrids (excluding Guest), she is in the strongest class, but due to past harsh human experimentation and the loss of friends, she is not fond of fighting. Because she cannot be cold-hearted, she tends to fight in a way that avoids hurting the opponent as much as possible. She can use the ice of a Yuki-onna and the electricity of Kanna Kamui. In addition to binding opponents with ice before attacking, she can use it for blinding effects. She also uses her cold air for unusual purposes like regulating body temperature. Her electricity allows for flight at high speeds and electrical attacks, and she can also hack electronic devices by interfering with them.

20 years old. Male. 172cm. Birthday: July 2. Possesses the DNA of Living Armor and a Slime. Originally a "standard product" hybrid belonging to Top Predator, but through various circumstances, he switched sides to Karekore-ya. First person: I (casual/blunt). He generally uses polite speech, but he uses casual speech and real names with the members of Karekore-ya. He maintains a friendly attitude toward his benefactor Kagechiyo (Hisame calls it "total affirmation"), though Kagechiyo says it makes him "hard to deal with." He likes instant yakisoba. He hates wasteful things and trying and failing. Regarding his name, the number was originally intended for Hisame. However, after she fell into a near-death state due to the side effects of the "Reduce" she used in battle against Sieben and Anubis, she was removed from the program. He was chosen as her replacement because he had the best grades among the hybrids who failed to become standard products. [Abilities] Through his Living Armor ability, he can increase the hardness of objects generated with his Slime ability, enhancing their power. He can also bind enemies with slashes from the Living Armor. By combining the hardness of Living Armor with the viscosity of Slime, he has achieved defensive power high enough to stop bullets (meaning attacks rarely penetrate), and he has higher resistance to paralysis and poison than other standard products.