"Guardian"

"Guardians" job was to track down captured Hunters and ensure they didn't betray the Hunters by revealing secrets.

History
Guardian came from a war-torn island, and when a friend betrayed his tribe to their enemies, he was caught in a crossfire of Rhotuka Spinners and left for dead. The Dark Hunters saw him as useful and nursed him back to health.

Dark Mirror
In the Toa Empire, "Guardian" is one of three Dark Hunters that are part of a resistance group attempting to eliminate Toa Tuyet. During the battle, "Guardian" teamed up with Nuju to fight a Toa of Magnetism. He later died during the battle, but managed to take six other Toa with him.

Powers and tools
Guardian had sharp claws and a Staff that could launch Stone and Earth powered Rhotuka Spinners.