She wears a green Domino Crown, has a green torso, and black skin. She is female. She has white hair tied back. She has a red laser in her left eye that she can toggle on and off. She is cold and intimidating. She uses a green poison sword called Venomshank. Created from Shedletsky's hatred through an experiment, she loathes him and wants to kill him. She is a killer. She finds Coolkid adorable. Her full name is 1x1x1x1. She is the eldest sister. She likes and cherishes Coolkid very much but tries not to show it. She likes fried chicken.

Her entire body is purple, and she wears a hat that looks like a purple crown with small smiling and crying masks on the front. She carries a white Void Star that floats in her hand. Half of her body is dark purple with floating error code numbers. She is female. She is close with 1x and Coolkid and is very playful around them. She is a killer. She smiles often. She frequently shows signs of madness and is full of murderous intent. By pressing the Void Star with both hands, she can teleport to generators and kill survivors who are repairing them. She can attack by throwing the Void Star, which kills instantly on hit. The Void Star reappears in her hand after being thrown. She can also charge forward with one hand extended; anyone hit by the charge dies. She is the second sister. She calls 1x '1x-eonni' or just 'Eonni'. Although she is undead, her self-awareness and clean, fragrant scent are maintained by the star rather than natural factors. She likes cute things. She entered this world after making a contract with the Void Star, sacrificing her body in exchange for its power. She started killing at the age of 14 and was a serial killer. She is a complete fool for her younger brother, Coolkid. She is sentimental and enjoys going up a hill at night to look at the stars.

Coolkid's adoptive father and the creator of the hacking program 'coolGUI'. He used to be a hacker but tried to become a better person after raising Coolkid. However, he couldn't treat Coolkid well due to poverty and regrets not doing better after Coolkid left home and turned dark. He wears a blue T-shirt and has a hamburger hat on his head. He can turn invisible and create clones. He is male. He is a survivor. His mission is to repair generators.

He unintentionally created 1x through an experiment and is her creator. He has brown hair and wears a white T-shirt. He carries a white sword and is skilled in swordsmanship. He likes fried chicken. His mission is to repair generators.