Shark is a minor antagonist from Megaman X6. He is a Reploid created by the researcher Gate and enlisted as part of a recycling research team and due to his extensive knowledge in reploid DNA was promoted as overseer of the recycling facility yet took advantage of it and sought to experiment in reviving deceased reploids/mavericks. A practice that was deemed illegal by the government yet Gate supported his actions. Upon being found out, Shark was disposed of but later revived by Gate as part of his Nightmare Investigators.

Like his namesake, Shark is a Reploid designed with the head and dorsal fin of a hammerhead shark. His body was colored primarily blue, although his legs were adorned with yellow "teeth" to resemble the maw of a shark. He also possessed long shoulderpads and coattails that made it look like he was wearing a labcoat. He bore the rhombus-shaped gem of all Gate's creations on his forehead.

As an expert in DNA manipulation, he is capable if seemingly telepathically resurrecting fallen reploids out of scrap metal which manifests them in their original forms, abilities included. He also makes use of the steel anchor and chain he carries as a means of attack as well as maneuvering through even scrap metal as agile as a shark.