Kipuna

Kipuna is a tulikko, a.k.a. a fire fox! During the day they look like a normal black fox, whereas at night their fur will spark and their tail will blaze, creating the northern lights as they sprint through the snowy fells with other tulikko. They're quite the trickster and a quick thinker.

The story and tulikko are based on Finnish myths and legends about the northern lights (called revontulet, literally "fox fires", in Finnish)!