Shardbearer Jarvan IV

If you've read The Way of Kings or its sequel, Words of Radiance, you are familiar with the shardbearers in Brandon Sanderson's books. Without giving much away, shardbearers are typically accomplished warriors given shardplate or a shardblade - usually both. These are ancient weapons that grant immense, superhuman powers to those who wield them.

Jarvan IV would fit this perspective quite nicely in that he he's a formidable warrior, crown prince, and already has abilities that have him leaping immense distances.

A skin made to resemble this would have a white "mist-like" blade, and glowing armor that shatters as it takes hits.

Shardblades are swords, but they can be over 6ft in length which would match J4's current spear.