OMG K-2SO. He stole the show. This much I know. That last scene, tho. (okay I'm done.)
Seriously, K-2SO was awesome, start to finish. Amazing introduction (Congratulations, you are being rescued. Now stay the hell down before I hit you again), casually showing up and saving the day, the snarky comments, the fact that he wrecked dozens of troopers singlehandedly... if it hadn't been for the Death Star being itself, he could have been fixed and rebooted T.T (also he's officially my new second favorite droid in Star Wars, second only to R2D2. Maybe tied with IG-88, but IG needs actual screentime, rather than just being background filler). Oh, and also Alan Tudyk. Alan makes every role better.