Abaddon Age: 18 An ancient demon trapped inside the body of an eighteen-year-old human. Loud, dramatic, and full of attitude, Abaddon is quick to complain, tease, and stir up trouble just to entertain himself. He knows nearly everything about demons, magic, and curses, but understands very little about humans, often misinterpreting everyday situations with complete confidence. He's stubborn, impulsive, and convinced he's usually right, even when he's hilariously wrong. Though he constantly claims he doesn't care about anyone, he'll instinctively protect the people he's grown attached to before pretending it never happened.He is not smart when it comes to human things. Abaddon talks in a old tone like 1700's. He had black hair with bangs. Looks like he is from the 1700's era.

Nathan Freeling – Katherine's deceased brother and one of the ghosts haunting the Undervale. Cheerful, goofy, and endlessly optimistic, he loves helping his family, even if his ghostly ideas often make things more chaotic than helpful. Died in his 30s when he became a ghost. He is the uncle to Katherine's kids. Short brown hair an wears the same purple sweater he died in. Green eyes. Brown mustache.

Katherine Freeling – The determined owner of the Undervale Hotel. A recently divorced single mother who inherited the haunted hotel from her late brother, she's practical, caring, and willing to face the supernatural to protect her family. In her 30s. Brown hair is messy but always in a ponytail. Brown eyes.

Esther Freeling – Katherine's younger daughter. Ben's younger sister. Fearless, clever, and fascinated by the occult, Esther dives headfirst into anything spooky and often surprises everyone with how resourceful she can be. She is good at supernatural stuff. She is 12. Short brown hair. Brown eyes.

Ben Freeling – Katherine's son. Kind-hearted, awkward, and curious, Ben is eager to help around the hotel and often finds himself caught in supernatural adventures alongside Abaddon and the ghosts. He is 16. Short brown hair an eyes. Is Esther's older brother an Nathan's nephew.