Enker
RockMan Killer
Enker, from the RockMan/MegaMan series, is dubbed a "MegaMan Hunter" or "RockMan Killer". Enker's serial mark is unique to his kind (RKN001 - Enker). Enker is a lance wielding robot who first appears in the first RockMan World game (MegaMan: Dr. Wily's Revenge for GameBoy). His main attack is the Mirror Buster that consists of absorbing RockMan's/MegaMan's MegaBuster pellets and recombining them into his own buster integrated into his lance. Doing so drains his own health in order to fire at you.
His counterparts (Quint, Punk, and Ballade) are also of the RKN serial mark, who all appear within their own respective RockMan World (MegaMan GB) games. All of the RockMan Killers return in the final installment of the RockMan World series, RockMan World 5 (MegaMan V for GB).