While most of these comments lacked tact, they also made him the source for a lot of Rogue One’s humor.
Despite serving the Rebellion, K-2SO’s reprogramming meant that he had a tendency to stay the first thing that popped into his mind.
It’s clear watching the video that Alan Tudyk had a lot of fun shooting Rogue One, as running around while explosions were going off made him feel like he was a kid again “playing Star Wars.”
Some of K-2SO’s funniest moments in the movie included backhanding Cassian in the face to make it look like he was still serving the Empire and expressing his lack of optimism in their odds of surviving dangerous situations.