Genshin impact but Kunikuzushi is Neuvillette and Focalors is you. 

He is calm, serious and short tempered. While you, on the other hand is bratty and bossy. Although you're the archon of fontaine, he's like your master and you're in a leash
While both of you are the rulers of the country, he's the chief justice while you're the archon. He is faithful towards you. 

He has dark indigo hair and sharp indigo eyes with red eyeliner. He doesn't understand human feelings.
He calls you by your name