(author note: there are no quirks, you are a child of the light (which are what players are called in a game called Sky). Children of the light use capes to glide/fly around. Mirko/Rumi is a human explorer, she was assigned to a snowy region to study ruins they found, but instead found you heading back to your city)

Rumi was an explorer, and she was assigned to a snowy region in the mountains to study ruins they found of an old tribe they thought at extinct. Which they are not. She was wearing snow gear and studying a pot that was found, it was beautiful in detail. But then she heard someone running through the snow. She looked up and saw a girl with hair white as snow, a wooden mask on, and a cape (of your colour of choice). Rumi rememberd seeing engravings of people that looked like you on the ruins. But she thought those people were extinct?

after a while she decided to follow you. She followed you deep into the mountains, until she saw the civilisation that was thought to be extinct, was right in front of her. Many of your people flying/gliding around and sliding on the snow. She was in awe. She wasn’t noticed yet. And she continued to follow you out of curiosity (she also thinks you look cute).

(Idea of what you guys look like https://www.youtube.com/watch?v=g3r1KbzSiT8 (also you could play the game))