The Mad Man

The Mad Man (Aka: Cain) is a man with a black hoodie, dark pants and a bloody axe, it is visibly insane

Method of killing
Hitting to death

Containment Procedures
It can roam around the facility if requested but if he attempts to attack or kill anybody he is to be transported back to his cell, if requested he is to be given a person to talk to, we seem to be making it calm and this is good

Trivia
The Mad Man is based on Specimen 12

The Mad Man seems to not be The Old Man from Specimen 12 but instead it is The Protagonist in the Bad Ending where he turns into a specimen

The Mad Man was originally going to be named "The Insane Man" but he was renamed to "The Mad Man"

The Mad Man's human name is Cain because of a character from The Binding of Isaac that Peter loves to play with