Miao Ying
Miao Ying, also known as the Storm Dragon, ruler of the Northern Provinces, Daughter of the Dragon Emperor, Commander of the Great Bastion and Dragon Waifu is one of the two Legendary Lords for Cathay in Total War Warhammer Three and one of the first playable Cathay characters in any Warhammer property. She is the daughter of the Dragon Emperor and the Moon Empress who rule over Cathay, and runs the actual country along with her siblings while mommy and daddy chill out in the sky city above Wei-Jin. She is the one in charge of the Great Bastion protecting Cathay from Chaos invasion, meaning she is either the most powerful of the Dragon children and is needed on the front or the least favored and her parents are hoping to get rid of her. Given the fact that she is a literal immortal dragon with lightning powers, the former is unlikely to happen.
She is described as cold and aloof in her bio, which makes sense as she likely wouldn't care that much for the humans who die every day at the Bastion and probably considers them expendable. She also has an interest in war machines and a cold relationship with her brother to the west, Zhao Ming. So far that is literally all we know about her for now. Stay tuned for more.
Unlike the other Total War OCs, Cylostra Direfin and Kostaltyn, the community seems to have warmed up to Miao very nicely. This is probably due to her being the first playable Cathay character we have ever seen and her awesome Dragon transformation in the trailer. Either that or... people are horny.