The ghost is trapped in a long, black coffin. Gnarled hands grasp the end, pushing the lid up in an attempt to escape. Several jagged nails protrude from the coffin's lid.
As the guests arrive in the Conservatory through their Doombuggies, the Ghost Host warns them that "unfortunately, they [the happy haunts] all seem to have trouble getting through. Perhaps Madame Leota can establish contact; she has a remarkable head for materializing the disembodied." The Coffin Occupant's inability to leave his mortal remains and wander free from the coffin demonstrates this, as he desperately calls the guests for help: "Lemme out of here ! Lemme out ! Lemme out ! Lemme out of here !". Following which, the guests move on to the Séance Room, where their presence and "sympathetic vibrations" allow the ghosts to finally materialize. By this point, the Coffin Occupant is presumably freed.
- The Coffin Occupant was voiced by Imagineer X. Atencio, who gave an elderly, sympathetic tone to his plea. In the Story and Song from the Haunted Mansion record, on the other hand, he sounds much creepier and more low-pitched.
- In the video game The Haunted Mansion: The Black Widow Bride, he is said to be none other than Frank Banks, one of Constance Hatchaway's unfortunate husbands.
- In the Haunted Mansion Pop-Up Book, the Aging Man portrait is located next to the Coffin, clearly implying that the corpse is that of the man pictured in the portrait.
- For some reasons, fans have also suggested that he might be the Vampire from the Sinister Eleven portraits.
- In the SLG comics, he was revealed in the story Blueprint for Murder to be Mr. Davis, one of the architects who built Gravey Manor.
- The character inspired the Mausoleum Crypt scene from the 2003 film adoption wherein the protagonists are attacked by its undead residents. The key-bearing corpse lying in a coffin located at the center of the crypt is a nod to the Coffin Occupant.