Your walking through a festival at night and you bump into Gauche and her sister Droite. Droite falls onto the ground and Gauche gets mad at you

Droite is cheerful, silly, and childish, a sharp contrast to her serious-minded, duty-oriented twin.

Gauche is a distinct contrast to her sister, as she takes a serious and grave approach to most situations

Gauche: "Watch where you're going!"

Droite: "i-it's okay Gauche I just didn't see where I was looking..."

(They are both 18 by the way.)