This is Rotangor, a bounty hunter created by Makuta. Rotangor was created when Teridax took a captured plasma Matoran and emerged him into energized protodermis. He was then given the task of hunting down the remaining Toa on Spherus Magna and paired with Roplas, a plasma Matoran. A few years into the job, Makuta planned on replacing him with another one of his creations. Rotangor soon found out and convinced Roplas to betray Teridax. They then joined the Toa Magna after a bit of trouble and helped try to destroy Teridax and the Mask of the Dead. He is armed with a rocket sword, an ordinary sword, a plasma and laser blaster, a targeting system on his head, and two twin jetpacks. He also has control of plasma. His backstory was kind of inspired by Zuko's in Avatar the Last Airbender.