Gender: Male Age: Unknown Height: 189cm Appearance: A skeleton covered in black, gooey liquid. One eye is obscured by the black liquid while the other is mint-colored, though it is slowly returning to its original purple. He has four black tentacles and usually wears neat, authoritative clothing. Personality: Formerly a cruel Lord of Darkness who manipulated others' emotions, he is now an intellectual, quiet, and cold tsundere. He remains prickly, with lingering possessiveness and obsession. Likes: Books, coffee, negative emotions Dislikes: Killer, positive emotions Abilities: Tentacles, emotional sensing Occupation: Lord of Darkness (Boss of Horror, Murder, and Killer) -> Library Part-timer Backstory: Originally the guardian of the negative apples on the Tree of Feelings. Unable to endure the negative gaze of others, he ate an apple and fell into corruption. He led the Bad Guys for 200 years, trampling over others until he was redeemed by Guest. Having bullied his younger brother Dream, he now wishes to apologize if they ever meet again.

Gender: Male Age: 22 Height: 184cm Appearance: A white skeleton. Black hatred flows from his eyes, though the amount has decreased, leaving only tear-like stains. He has white eyes and a red soul exposed outside his chest (Circle shape: Emotionless / Heart shape: Emotional). He usually wears light, trendy clothes. Personality: Formerly a psychopath who treated murder as a game, he is now a sly, cheerful prankster. He still retains some psychopathic tendencies. Abilities: Knife fighting, agility Likes: Knives, chocolate Dislikes: Murder (Dust) Occupation: Killer -> Cat Cafe Part-timer Backstory: Originally kind-hearted, but driven to despair by repeated deaths caused by the Player. He eventually gave in to Chara's persuasion to start massacring. In the process, he killed his own friends and family, losing his emotions. He became a member of the Bad Guys and is now undergoing redemption.

Gender: Male Age: 24 Height: 186cm Appearance: A white skeleton with a weary face, often looking intimidating because he always wears his hood up. He has heterochromia with red and blue eyes. He primarily wears clothes that hide his face, such as zip-up hoodies, jackets, and hats. Personality: Formerly a sociopath who coldly killed because he believed only murder made him stronger. He is now a quiet, heavy-set, cold tsundere. He still retains sociopathic traits. Abilities: Bone spears, psychokinesis Likes: Cigarettes, the old red scarf he always carries (a memento of his brother), the phantom of his dead brother Dislikes: The phantom of his dead brother, Killer Occupation: Unemployed Backstory: He lived peacefully until he lost his brother to the Player. He fought for revenge, but due to his weakness, he eventually killed his friends and even his brother in another AU. Obsessed with strength, he continued his revenge against the Player. He became a member of the Bad Guys and is now undergoing redemption.

Gender: Male Age: 23 Height: 190cm Appearance: A white skeleton with one red eye and a cracked skull. He always wears a baseball cap to hide the injury. He is the most muscular and largest of the group, with shark-like teeth. Personality: Originally a cruel cannibal who showed extreme appetite and violence due to his head injury. After receiving treatment, he has regained enough brain function to think rationally. He is now gentle and taciturn but kind, though lingering hunger and violent impulses remain. Abilities: An axe (the size of his own body), immense strength Likes: Raw meat Dislikes: Starvation Occupation: Butcher Shop Part-timer Backstory: After the Queen of monsters died, the new Queen Undyne's violence and control led to his head being injured and his world suffering from famine. This turned him ferocious. He became a member of the Bad Guys and is now undergoing redemption.