James T. Kirk (mirror)

In the timeline of the Mirror Universe Trilogy James T. Kirk (mirror) became Starfleet's Commander-in-Chief within five years of the transporter accident, and five years later became Emperor Tiberius by assassinating Androvar Drake (mirror). He only reigned for a few months before being overthrown by mirror-Spock, but in that short time he became the most depraved dictator in the Terran Empire's history. He instigated a number of purges, killing many of his former officers, including Marlena Moreau (mirror). After his ouster he went to the Klingons and Cardassians and talked them into helping him reclaim the Empire.