Kang the Conqueror

Kang the Conqueror is a supervillain in Marvel Comics. Kang is a time traveller from the 30th Century who has frequently travelled to the present day and fought the Avengers.

The man who would become Kang was, in his native timeline, a scholar in a utopian age of peace. He was restless in this world, and studied the history of war to the point that he became obsessed with it. He discovered time travel technology that one of his ancestors (who may have been Nathaniel Richards or Doctor Doom) had invented. Using this technology, he travelled back in time to ancient Egypt and became the Pharaoh Rama-Tut. After being driven off by the time-displaced Fantastic Four, he left the past and reinvented himself as Kang the Conqueror--rather than dwelling in one timeline as its ruler as he had done as Rama-Tut, he would conquer many timelines and rule them from a future of his own creation. On his first foray into the twentieth century, he was thwarted by the Avengers, and they have remained his enemies ever since, having fought him on dozens of occasions.

At some point in his personal timeline, Kang became (or will become) weary of battle, due to frustration and the loss of his son Marcus and consort Ravonna in several timelines. He was approached (or will be approached) by the alien Time-Keepers--time travelers from the end of the universe, the last living creatures in existence--to become their agent, preserving timelines rather than conquering them. He accepted (or will accept), and reinvented himself again, this time as Immortus. He again came (or will come) into conflict with the Avengers, but under different concomitance, and more notably with his younger self, who was unable to see the reasoning behind Immortus' actions. Immortus faked (or will fake) his death several times before ultimately turning on the Time-Keepers to assist the Avengers and, as punishment, was apparently killed, this time permanently.