"A Hero that transcends time 超世之英杰 (chāo shì zhī yīng jié)"
Why is he a Demi-God:
Nearly every Chinese in the world would have heard of his name. It is not just his achievements that are spectacular, his use of military tactics and his overall leadership ability is legendary. The description is no exaggeration; Cao Cao truly is a hero that has transcended time. That fact that we are playing a card game that is built-upon that the Three Kingdoms story is proof of this. You might ask, "What about Liu Bei 刘备 or Sun Quan 孙权? Are they not in the same league?" Perhaps. Both of them were extraordinary in their own rights, but the drama that is Cao Cao is what makes him stand out from those two. It is well-known that the Romance of Three Kingdoms story down-played a lot of Cao Cao's achievements and his more humane side, thus what we know from the story is only a part of his full story. Cao Cao deserves to be a Demi-God, because he is arguably the most important person in the entire era.
Character ability 1: "Homage 归心 (guī xīn)"
For every 1 unit of damage that you receive, you can draw one card from every character in play (equipped cards, on-hand cards, or pending judgement cards). After doing so, you must flip character card.
Character ability 2: [Enforced ability] "Flying Shadow 飞影 (fēi yǐng)"
When other characters consider their distance from you, you will always have additional +1 distance away (equipped +1 horse by default).
Ability's relation to story:
"Homage" is exactly what the word means; bow to the God that is Cao Cao and offer him your cards for his picking. "Flying Shadow" is a word play on his favorite steed "The Shadow 绝影", which is a +1 horse in this game.