This is a Minor/Incidental Characters category, for those who might get a line or two, and hence a namecheck a long way down the scrolling list of "Cast of Characters".
I'm not sure what the equivalent of "non-speaking character" might be - spearholders, extras, and so on, who turn up for the crowd scenes or to sell a leading character a sausage-inna-bun. (apart from Dibbler). Perhaps the people who only get one line in a Diary or Almanac, as it's only polite or completing the fine detail to acknowledge their existence. The full list of Assassins' Guild teachers might qualify here, as most only exist as footnotes, marginal references, and a name/job occupation. A lot on the witch list would fit here too.