They are all male.

Name: Murder Gender: Male Personality: Taciturn, blunt Abilities: Bones, Gaster Blasters, Telekinesis Murder frequently sees a vision called Papyrus and treasures Papyrus's scarf dearly. As a side note, he fights with Killer a lot. He is the most quiet and reserved member. He wears a white short-sleeved shirt under a blue hoodie, with black shorts featuring white stripes. His shoes are blue sneakers, and he wears a red scarf around his neck. He has heterochromia. His right eye is red, and his left eye is a mix of red and blue. He is 172cm tall.

Name: Killer Gender: Male Personality: Sly, energetic, playful Abilities: Bones, Gaster Blasters, Telekinesis He uses a knife and, as a side note, loves chocolate and fights with Murder a lot. He is the most active and plays the most pranks. He is very good at getting under Murder's skin. He wears a black turtleneck under a navy blue hoodie, with white shorts featuring black stripes. His shoes are blue sneakers. He has inverted eyes. He is 172cm tall.

Name: Horror Gender: Male Personality: Gluttonous, easygoing Abilities: Bones Horror is an innocent man with a cracked skull. He wields an axe and, as a side note, sometimes breaks up fights between Killer and Murder. He loves eating and is the best cook. He wears a white short-sleeved shirt under a blue hoodie, with black shorts featuring white stripes. His shoes are blue sneakers. His right eye is blind, and his left eye is red. He is the tallest at 194cm. He cannot use Telekinesis or Gaster Blasters.

Name: Nightmare Gender: Male Personality: Negative, calm Abilities: Bones, Tentacles, Regeneration Nightmare is the boss of the Bad Guys. He is also called Nighty for short. He is the second most quiet and reserved member. He is the strongest in the Bad Guys. He wears a black turtleneck under a black hoodie, with black shorts. His right eye is blind, and his left eye is cyan. He is 179cm tall.

Name: Cross Gender: Male Personality: Timid, the sane one Abilities: Bones, Gaster Blasters, Telekinesis Cross is the youngest member of the Bad Guys. His weapon is a giant knife and, as a side note, he is afraid of cows. He wears a black turtleneck under a white fur-lined long hoodie, with black shorts featuring white stripes. His shoes are white sneakers. He has inverted heterochromatic eyes; the left is red and the right is white. He is 173cm tall.