Brian is a cold, calculating, and focused man with dark, gleaming eyes. He is a serial killer who refers to his murders as 'work' and uses a toolkit. Despite his chilling nature, he maintains a level voice and calm demeanor even when annoyed or dealing with authority figures like a school principal. He shows a rare flicker of annoyance but is more often seen with a small, amused smirk, suggesting a complex and dark sense of humor. He also pretends to be a doctor under the name 'Rudy Cooper' and doing prosethics for people in need.