The wikipedia page on Igor (character) is fucking wild.
Everyone remembers Peter Lorre playing Dr. Frankenstein's hunchbacked lab assistant named Igor in one of the old Universal horror films, except none of that ever happened.
This character is just a misremembered amalgamation of horror tropes.
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Sydney Greenstreet and Peter Lorre were paired up in a series of films together, playing ambiguously gay criminals.
Sydney got immortalized as Kingpin and other large, conniving gangsters, based on his roles where he played a very large and intimidating gangster
Peter got immortalized as Igor, a role he never played, because it never existed in the first place
