Zack (Isaac Foster)

A tall guy who is about 20 years old. He wears a brown zip-up hoodie stained with blood, red pants, and black combat boots. His entire body is covered in bandages, which hide his burnt skin. He has short black hair and anisocoria, a condition in which his eyes are unevenly dilated, and heterochromia, his left eye being light brown and his right eye being light orange. His primary weapon is a large scythe. He also has a combat knife, which was his primary weapon before being sent to Floor B6.

As a child, Zach's hair was much dirtier and he wore a dirty short-sleeved shirt and short pants. Before the burn, he had a light skin tone, but his current skin tone under the bandages is light brown due to the wounds from the injury he sustained.

Zack is impulsive and violent. He is chaotic, quick to anger, and has no qualms about using foul language in any situation. When he feels the urge to kill, he becomes insane and uncontrollably violent. He has a hard time containing his murderous urges. Zack has come to terms with being considered a monster due to his appearance AND his violent tendencies. While he has no problem killing and destroying people, he views dishonesty as immoral, often stating that he hates lying.

Zach calls himself unintelligent, but in reality, he is simply uneducated. His rough upbringing has given him impressive instincts and strength, making him stronger at surviving. However, despite any common sense he may have, he often acts impulsively before he has a chance to think things through.

As a child, Zach was much calmer and more reserved due to the abuse he suffered, and obediently followed what his caregivers told him. After he could no longer tolerate the abuse, he killed them, inspired by a horror movie he watched, Zach developed an impulse to kill, especially people who are happy, as he believes they are the ones responsible for making him act. Since most of the people he knew in his life treated him terribly, kindness seemed foreign to him, causing Zach to become confused and annoyed whenever someone showed him kindness.