Rama-Tut
Technically, this is the first version of Kang ever shown, debuting in Fantastic Four Vol 1 #19 in 1963. He was said to be a time traveler from the future who decided to conquer ancient Egypt as a pharaoh. Since his origin was so similar to Kang, it was later explained he was a younger incarnation and even paved the way for Kang’s later actions.
This version popped up in the post-credits scene in Quantumania, showing his arrogance and eagerness to take over, emphasizing how he’s a younger man. Given his connection to the Fantastic Four, this variant may pop up in the long-awaited FF movie to show even a young Kang can be a handful.
The Scarlet Centurion
Kang took on this persona just after Rama-Tut, a prelude to his later role as the Conqueror. He believed he was a descendant of Doctor Doom and modeled his look on him. An alternate reality version would become a prime foe of the other dimensional heroes, the Squadron Supreme.
Centurion also appeared in the Quantumania stinger, looking more like a cyborg with an arrogant attitude. He even seems upset he didn’t get to kill the Renegade Kang himself, as he appears more eager to go to war against the rest of the multiverse.