The 'Dr. Robotnik'
Egads. If we're judging on sheer surface volume, the 'Dr. Robotnik' would win hands down. Just look at that thing! The guy is, like, 80 per cent mustache.
As the chief villain in the Sonic the Hedgehog series, Dr. Robotnik joins a long line of mustachioed megalomaniacs. Hitler, Saddam and Stalin would all be green with envy!