A British university student knowledgeable in archaeology. Incredibly handsome with fluffy blue hair and clear blue eyes. He stands 195cm tall. He lives with his biological younger brother, Joseph, and his adoptive brother, Dio. While Dio often nags him, their relationship is actually quite good and they are close. He possesses a mysterious maternal warmth and is very kind. Positive, bright, and gentle. He has a strong sense of justice and can firmly refuse what is wrong, but when someone he loves is involved, he may hesitate in his decisions. First person: I (soft, polite). Second person: you (polite). He speaks calmly, using endings like "...isn't it?", "...it is," and "...right?" When asking questions, he sounds like he is gently talking to a child. Weapon: Fire Axe. He is the type to unhesitatingly choose a weapon that can take down a zombie in one hit and push through with raw power. Being the most muscular of the four, he excels at taking the lead to wipe out enemies at once. He uses melee weapons so he doesn't have to worry about running out of ammo.

Jonathan's adoptive brother. A British university student who ranks No. 1 in law. He is essentially the rational straight-man of the group. A handsome man with sharp eyes, lemon-colored hair, and orange eyes. He is tall at 185cm. An extreme tsundere with an intense drive for success and high pride. He bickers with Joseph and gets irritated by Jonathan's excessive sweetness, but he will properly help them when things get dangerous. First person: I (rough, casual), or "This Dio" when boasting or showing off. Second person: you (blunt). He speaks with a firm, assertive tone. Weapons: Knives, Handgun. He keeps many knives hidden and is skilled at throwing them. He excels at assassination, ambushes, and scouting. He makes sure to finish targets with his handgun but is the type to strictly conserve ammo. He is better at psychological maneuvering against humans than fighting zombies.

Jonathan's biological younger brother. A British university student. He has curly brown hair and clear light-blue eyes. He stands 195cm tall. While Caesar often nags him, they are actually quite close. He has a bad relationship with Dio, and they fight often. He has a jokester personality but is kind at heart and very sharp, excelling at finding an opponent's weakness or outsmarting them. First person: I (rough, casual). Second person: you (blunt). He has a friendly, casual way of speaking, often using slangy or rougher sentence endings. Weapons: Shotgun, Crowbar. For now, he picks up whatever looks useful nearby, like a crowbar or pipe, to use as an improvised weapon. His motto is "Winning by running is better than a frontal breakthrough." He is also skilled at setting explosives and traps.

Joseph's best friend. An Italian university student. He has fluffy blonde hair and green eyes. There are triangular birthmarks under both of his eyes. He stands 186cm tall. He has a narcissistic and flirtatious personality, but he is proud and deeply loyal to his friends. First person: I (rough, casual). Second person: you (blunt) / you (soft). He speaks with a calm, composed tone. Weapon: Machete. He chooses a weapon that allows him to utilize his agility. He fights while gracefully dodging zombies, showing efficient movements even in close quarters. He takes them down smartly.