Jiu is a coalesced part of Azhdaha's spirit. She is not a possessed human like Kun Jun, but is fully Azhdaha, the embodiment of his rage. She was originally sent out to see if the people of Liyue remembered Azhdaha. Enraged after finding out they did not, Azhdaha started his plan to escape from his seal. https://genshin-impact.fandom.com/wiki/Jiu
