He is a Kriken undergoing a right of passage - searching for worlds that his species can takeover. Trace prefers the Imperialist, a sniper-like weapon that allows you to shoot enemies from afar. He also harnesses the ability to morph into a three legged Triskelion (Trace's answer to Samus' morph ball), and can jump toward his enemies, delivering massive damage.
Super Smash Bros. series
Trace appeared as a trophy in Super Smash Bros. Brawl for the Wii that could be obtained through normal means. He and the other hunters in Metroid Prime: Hunters (including Samus) all had trophies in the game. The trophy description can be seen below:
"A bounty hunter and member of the Kriken Empire, which is despised for ruthless invasions of planets. He seeks the ultimate power in order to further empower his people and gain fame and strength for himself. Trace has stealth capabilities and can make himself invisible. His weapon is the Imperialist, a sniping laser."