AP- Thanks for the links to the films. That 1927 film is quite like MGM's shorts series, "Our Gang". from the 1920s through early '40s. And the comic strip had a bit of the flavour of The older Ginger Meggs comic strip.
And the nick-naming of the person as the opposite of his/her qualities was not just a Cockney tradition, but an England-wide tradition (note "Little John" in the Robin Hood Tales), and we have it in Holland and Germany as well. I think it's a fairly old tradition in all The Germanic countries, and France, too. I, myself, had the nickname "Black", and it wasn't from being a bad or mean-spirited person, and I am
(was) a redhead, with pasty-white skin (almost an albino).
Link to the comment:
FATTY FINN'S COMIC vol.3 no.7