Blaine

Captain Blaine was a Starfleet officer of the mirror universe's Terran Empire and a personal enemy of Kirk.

History
In 2285 he met the regular universe's Kirk posing as his mirror counterpart in a bar and the two got into a fight, with Kirk gaining the upper hand. However, instead of killing Blaine Kirk spared his life, telling him he isn't worth it.

Later, he was in command of an Imerial Miranda class starship with the registry NCC-1877 that was part of Kirk's "invasion fleet" to conquer the Federation. Later, when Admiral Turner informed the fleet that Kirk was a traitor, Blaine took command of the assault on the USS Excelsior, but was unable to stop Kirk's escape. 

For his failure to stop Kirk, he was then brought before the High Council of the Empire, expecting to be sentenced to death. The Admiralty, however, recognizing that hatred is a very strong motivator, instead gave him command of their newest starship, the ISS Excelsior, and an attack fleet and tasked him with killing Kirk. When one of his ships, the ISS Nixon, located Kirk, Blaine tasked its captain, Trask, with leading the first assault and when that assault failed Blaine ignored Trask's warning and joined the battle himself. However, since the ISS Excelsior was only operating on one tenth of her power she was easily overcome.