Marquess was born on July 20, 1844.
As common among stereotypical ghosts, Marquess' attire, complexion, and hair color and completely white. Having been born in the nineteenth century, Marquess dresses very formally, always dressed in a suit and top hat. He is tall with a lean, but well-built physique, along with glasses and a mustache.
Marquess is perhaps the most honest, polite, courteous, well-mannered and compassionate member of the Mystery Team. However, due to being homosexual, Marquess is very effeminate, in addition to being easily anxious, agitated and somewhat cowardly is stressful situations.
Perhaps as a result of their contradicting personalities, Marquess is frequently a target of Pigeon’s crude jokes, which usually involve mocking Marquess for his sexuality and effeminate interests.
Marquess has demonstrated numerous unhealthy habits, including chain-smoking cigarettes and alchoholism, which he has failed to overcome and is very self-conscience about.
- He is Jewish.
- He is the ghost of John Douglas, 9th Marquess of Queensberry.
- The Marquess portion of his name is pronounced "Marcus" and rendered as if it is his actual name, instead of a title.