Wind Spirit

Vindr, though also goes by Veðr by the elderly, is the wind spirit that the reindeer both adore and fear.  While they're usually sweet, they have quite the temper and have the nickname "Tempest" by some reindeer who has seen their wrath of cyclones, hurricanes, and other storms.  Calves are told stories by their parental figures to respect the wind, especially if Vindr whispers in their ear.  It's also believed by the reindeer that Vindr controls the birds, helping them to fly.

With the wind ever present in the north, Vindr is the most powerful spirit and their appearance showcases this by being very tall, their entire form looks like white/gray clouds while their antlers are made out of lightning.  They can also be seen as just a head with a wispy body, but Vindr only uses this when directing their magic.  Their eyes are amber, but they change color depending on if there's a storm, or they are angry.