Commander Samuel Vimes, hands down.

His arc goes from zero to a million over the course of the Discworld series; even when he just has a slight Cameo he steals the scene because you get to see how terrified people are of him.

Who had ‘Lab grown Black Hole?’

Deport the illegal aliens!

I’m a native English speaker, not fluent in any other languages, and I still fuck up it’s / its on a regular basis.