Kang in Marvel Comics is a highly intelligent and formidable adversary. He can traverse different timelines and often poses a serious threat to the stability of the multiverse.
Kang is a major antagonist. He has advanced technology and the ability to traverse different eras. His goal often involves ruling and reshaping the universe to his liking.
My answer was not accurate enough. According to my knowledge of online literature, there is no description or mention of a 70-year-old woman named "Kang Kang". You might have remembered the name or the plot wrongly. If you can provide more information, I will try my best to answer your questions.
In many comic storylines, Kang takes on the role of a timekeeper. His ability to control and manipulate time makes him a significant and complex character.
Kang wasn't typically black in the comics. Usually, his character was presented with other characteristics. However, the comic world is diverse, and there could potentially be an exception I'm not aware of.