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There is an old Mickey Mouse cartoon entitled "The Mad Doctor", with the titular antagonist's name being listed as "Dr. XXX" on his door. The cartoon also features him taking off a disguise, as well as prominently features skeletons. Maybe this was an early idea of him being a skeleton in disguise? Link to the episode is here.
Edited by SumDumNerd Read "Ghost Stories of Remnant" here.
On a Discord chat I'm one someone recently bought online what appears to be a storyboard sketch from some old cartoon. The sketch shows an apparently fat character (labeled as "Doctor XXX") entering through a door and taking off his coat, revealing it's actually very thin underneath. Any clue? Here is the pic◊.
Edited by PhantomDusclops92