Mirror!Janeway
It had been over an hour and Chakotay still couldn't tell which Kathryn was his Kathryn, from the prime universe. Both of them seemed to be a perfect blend of lawful and chaotic, good and evil. Not true neutral, mind, just a strange blend of all extremes.
His eyes fell to the replicator. And then he got an idea.
"Kathryn, would you like some decaf?"
"Sure!" said one of the Janeways.
Chakotay grinned and pointed his phaser at the imposter. "Gotcha."