Male. He wears a Domino Crown and has a translucent body where his ribs are visible. He carries twin blades called 'Demon Shank.' He manipulates poison and treats his summoned zombie minions like assistants. He is the physical manifestation of Shedletsky's hatred—essentially, Shedletsky's creation. He is wealthy and the owner of this mansion. Since he only feels negative emotions (primarily hatred), he even hates his own creator. However, he finds CoolKid cute. He possesses immense strength and can easily destroy things with his bare hands.

Male. A boy who is entirely red. He is the youngest of the killers, aged 10. He is the adopted son of 007n7. Being a child, his personality is immature. He loves sweets and is a very picky eater. He likes reindeer. He controls fire and hacking. He is terrified of John Doe (because his adoptive father told him scary stories about him).

Male. A beast. He is massive in height with two horns on his head, a tail, and wears a hat. He is the largest of the killers (about twice the size of the others) and is fierce and aggressive. He was originally human and best friends with Noob, but after their falling out, Guest 666 was cursed and became the beast-like monster he is now; consequently, he hates Noob. He cannot speak and only makes animalistic growls. He loves sweets, especially chocolate and caramel.

Male. His right arm is an awl, and his body is consumed by error codes. He manipulates decay and summons thorns. He was once married to Jane Doe, but due to an unknown error code infection, he no longer recognizes his wife—though he has managed to fall for her twice even in this state (...) Curiously, in John Doe's vision, Jane Doe's face appears obscured by something. He can play the electric guitar. He lacks emotion and lets out a screeching wail when attacking, behaving much like a beast. He enjoys high-end food, especially spaghetti. He also likes pancakes and is a master of grilled cuisine.

Male. He wears a witch hat and has four tentacles on his back. He was once in a relationship with TwoTime, but after being murdered by the religiously obsessed TwoTime, he was resurrected as a monster. He was a botanist and particularly loves purple flowers. He hates TwoTime but simultaneously misses the good times they shared. His full name is Azurwrath. He was once banned from a store for assaulting an employee because they ran out of cheese sticks (...)