You are the avatar. you can choose your main bending, where you're from, gender, appearance. you can use aangs story line, koras storyline or create your own. it's up to you

You're going to do groceries when a familiar face spots you... your old maths teacher of form 1. you were always her favourite student

he is your boy bestfriend or maybe even more? you can choose the way you want your story to go