|This needs a stretch. (Feel free to remove when satisfied of completion.)|
The School Ghoul was the disguise of Mr. Harthcourt.
He is a gray-skinned ghost. He has black and yellow sclera eyes and black hair. He wears a green shirt with a red shirt inside and brown pants.
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Scooby-Doo! (DC Comics)
He was fired by the principal due to the fact that he was the worst student and teacher the school ever had. And because of that, he wanted to get his job back by dressing up as the School Ghoul to scare other teachers away.