| Please note the following:
He served as an anti-hero in The New House!, the secondary antagonist for the last 17 episodes of Season 8, and the main antagonist of the first 33 episodes of Season 9. Having been murdering countless people (including Bowser Junior in Pinch! Pinch! Pinch!) and planning to murder the gang, he almost succeeded in murdering Mario, Rosalina and Jeffy before being shot in the head by his brother.
Does Bad Things Guy took Brooklyn T. Guy's place for 7 months. He was a ruthless spree and a serial killer that murdered the 26 people who bought the house before Mario and Bowser did.
Does Bad Things Guy sold the house numerous times to his victims but warns them not to go in a door in one of the rooms as behind the door is the bodies of his previous victims.
If they stayed out of the room, he did nothing and left the new residents to themselves, but if they disobeyed the orders and opened the door, he knocked them out, tied them in chains, and killed them in a variety of brutal ways. After his victims were dead, he took photos of the mangled corpses and hung them up.
When Does Bad Things Guy filled in for his brother, Brooklyn T. Guy, he has the same personality as his twin brother.
However, in The Secret Door!, he was revealed to be evil, homicidal, violent, sadistic, cruel, bossy, angry, dangerous, heinous and heartless.
Does Bad Things Guy was also shown to be strict since he does not allow people to open or enter the secret door.
Likes and Dislikes
- Killing people
- The gang (formerly)
- Posing as his brother
- The secret door
- The new house
- Doing bad things
- Being evil
- Dead bodies
- His only identical twin brother
- 26 Deceased Victims
- Anyone who disobeys the rules and enters the secret door
- Not being a murderer
- Thomas (Possibly)
- His wife - His first victim, it is unknown why he murdered her since he had no secrets behind the door yet.
- 25 Unidentified Victims - Does Bad Things Guy brutally murdered 25 more victims, ranging from adults to children, he killed them in multiple different ways with multiple different weapons, including nails, knives, different types of saws etc.
- Unnamed man at Thanksgiving- Not one of his normal victims. During Thanksgiving, he tells everyone a story about busting a guy who had a turkey and frying him in the electric chair to death.
- Bowser Junior (non-canon) - When Junior goes overboard in pinching people and tries pinching him. Does Bad Things Guy uses this as an excuse to shoot Junior.
- Thomas - Possibly in Bowser Junior Goes to Military School!.
- Despite murdering the 26 people, he also killed others as part of him acting as a cop.
- Does Bad Things Guy is the second character to fill in for another character over a period of time, the first being Robot Chef Pee Pee.
- He also killed Bowser Junior in Pinch! Pinch! Pinch!, however that murder is non-canon.
- He was most likely inspired by notorious serial killer Jeffrey Dahmer.
- He was also Brooklyn T. Guy's only identical twin brother.
- In The Secret Door!, Brooklyn T. Guy returned, and Does Bad Things Guy was shot and killed by him.
- He possibly appeared in The Pizza Delivery!, Who Wants to Be a Millionaire? Episode 3, Bowser Junior Goes to Military School!, Bowser Junior Goes to the Sun! and Bowser Junior's Package!.
No information available