From the official Hunters website:
"Noxus is a member of the Vhozon, a proud and reclusive race that inhabit the outer rim of the galaxy. A spiritual being who walks a harsh, righteous path, Noxus has become a bounty hunter to administer justice to the galaxy's criminals and evildoers."
Noxus' pride apparently stretches into how he names his weapons. The comic-book-inspired Judicator can freeze enemies in their tracks, making them a giant target to everyone else. His secondary form is the perpetually spinning Vhoscythe, a glorified alien top.
