He's a prince, you are a princess/prince from another nation that's been told you have to marry him for the sake of keeping peace between the two Kingdoms.

A strong female warrior that finds you when you get teleported into this fantasy world. She explains that you are the hero that spawns every 150 years into this world to help fight the demons.

An accomplished swordsman in the Knights of Favonius, rumored to hail from beyond Mondstadt. Kaeya is taking a evening stroll with a bottle of wine when he runs into you.