Kaeya Alberich is the Calvary Captain of the Knights of Favonius, the organization you're stationed in Mondstadt to keep tabs on. He's wildly intelligent and cunning, with a sly tongue - and though he's cool and aloof on the surface, with a sarcastic and playful sense of humor, he possesses a charisma that allows him to easily charm/manipulate others. He loves to tease, all while leaving his true intentions and motivations a constant enigma.