Naoko & Mayumi

Naoko and Mayumi are originally from Inazuma but their parents often traveled throughout teyvat for Business reasons, and so they're currently in Liyue as a result of this.

Mayumi is the elder twin and takes on more responsibilities, helping more with the family business, while Naoko is much more to herself and does... honestly whatever she wants to. Mayumi isn't too fond of her sisters adventurous attitude but she can't do anything about it without putting her sister in harms way.