Jack Frost: The Two Paths

The two concepts of good and bad Jack Frost.

Right: Elvish concept.
Jack, by myth, is an ice elf. I know in the film he represented more human features but in his character profile the developers did say he was an ice elf. So I thought, maybe he just hasn't evolved to his full potential yet. The more kids begin to believe in him, the more he starts gaining elvish characteristics and new powers. Thus he almost becomes the winter weather himself like the wind, ect. The outfit still feels a bit uncompleted but it's basically the general idea.

Left: Frost Bite concept.
The outcome of Jack agreeing to join Pitch. He was plagued by the fearlings and lost memory of ever being Jack Frost. I like to think he betrayed Pitch and decided to create chaos all on his own. It was then he renamed himself to Frost Bite and used his powers over the winter weather to hinder and even endanger peoples' lives. For example, he'll use the condition of frost bite to render people's limbs black and dead so they may lose said limb, therefore losing a part of themselves. A messed up way to fill this emptiness he holds within himself.