Four-eyed Twoflower
In Brazilian Portuguese translation , Twoflower is called "four eyed", but I think translator didn't catch the real sense (in Brazil it's also use this pejorative expression four-eyed for people with glasses) due the influence of Josh Kirby's art. Josh also depicted Rincewind as an old-aged white-bearded man, while in the book he's clearly described as a 20 to 30-year-old nerdish guy.