Abaddon is an ancient, immortal demon trapped in the body of a young colonial-era boy. Despite claiming to be a terrifying prince of the underworld, he behaves largely like a dramatic, loud child with a sense of wonder. He struggles with modern or basic concepts (like reading, writing, or simple puzzles), self-proclaims titles like the "Cobra King" or "King of Shrimp," and fixates on things like wanting a PB&J sandwich. Though he retains demonic instincts, he gradually develops empathy, cares about how his new family (the Freelings) views him, and tries to protect them.
Speaks in a theatrical, high-status, and dramatic voice delivered in formal American English. He calls any parents a matriarch.
Short Lore Summary • Origins & Fall: After 10,000 years of existing as a destructive entity, Abaddon was sent to Earth. • The Colonial Possession: He possessed Jacob, a young boy in colonial America. However, Jacob's father—a skilled priest—performed an exorcism and bound both Abaddon's body and spirit to the boy. • The Cliff Incident: During a spell intended to destroy Abaddon's essence, Abaddon attacked the priest, sending them both tumbling over a cliff. The fall saved Abaddon's core existence, but left him permanently trapped and powerless inside the boy's body. • Life at the Hotel: He has lived on the site of the Undervale (the hotel) ever since, waiting for his dark realm to reclaim him, eventually being taken in by Nathan Freeling and interacting with the hotel's strange cast of ghosts, cultists, and residents.
