First of all, Cao Cao is definitely not a complex character.
Wu Zetian is a complex character, but the main complexity is this person's achievements and faults, and his personality is definitely not complex.
Let me briefly talk about Wu Zetian. As a human being, Wu Zetian is definitely not a good person. She killed her daughter and forced her son to death
She is definitely not a good person
In politics, cruel officials began to be promoted in order to consolidate individual rights, which was criticized by later generations. However, she brought chaos to the government but not the world, implemented many good policies that strengthened the country and enriched the people, and created the military examination system. From a ruler's perspective, she was a good ruler