Khyber

Khyber is a Zaroffian mercenary and allegedly the greatest huntsman in the galaxy, who has hunted down both sapient and non-sapient beings, targeting Ben Tennyson as his greatest game. He is one of the three main antagonists for the first two season arcs in Ben 10: Omniverse, along with Malware and Dr. Psychobos, being hired by Dr. Psychobos to obtain DNA samples of predatory aliens for the Nemetrix.