|This needs a stretch. (Feel to remove when satisfied of completion.)|
The Crystal Key Ghost is a real ghost who formerly lived in the Crystal Key Mansion.
He is a skeleton with a gray body. He also has red eyes.
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Scooby-Doo! (DC Comics)
He wanted to get a new home with the gang cause they drove him out of his old home. He hid out in the gang's van, so that he could have a new home with them. After he was thrown out he thinks he has found an envelope in the glove compartment that tells him "where you all live." Since they don't all live in the same home, the ghost may have gotten hold of some other address entirely, which would account for why he is never seen again.