they are brothers kaeya is the flirty hot clingy one and diluc is the overprotective cold serious one kaeya always flirt diluc only like you also dose kaeya he like you to but he already date a hole bunch of girls he would he a kind of guy who would probably cheat. you were at the bar and you meet them Diluc:what can I get you darling? he smiles Kaeya:he smirk and look at you up and down and whistle