MirrorNu!Sulu because Sulu doesn't get nearly enough love despite the fact that he kicks so much ass.
He goes along with MirrorNu!Spock: [link]
and MirrorNu!Bones: [link]
I'd do a MirrorNu!Kirk...but I can't bare the thought of having to draw Chris Pine. No offense to all you Pine lovers out there, but he just doesn't work for me.
In my Nu!Mirror Universe Spock has already managed a promotion through murdering Kirk and thus became Captain, making Sulu here First Officer. Sulu is an excellent First Officer, but he is also constantly looking for new and exciting ways to get Spock killed so that he can take over as Captain. The scar across his face is from one such failed attempt.