Rush is a Mutant Kineceleran Hybrid and one of the Antitrix aliens.
Rush has green skin, with his arms and face appearing to resemble armor. Unlike the reboot Kinecelerans, he has three digits on each arm. He does look similar to most Reboot Kinecelerans.
Ben 10 (2016)
Rush also appeared in the episode I Don't Like You, where Kevin turned into him to show off his abilities on the internet.
In the episode Roundabout: Part 1, Kevin turned into Rush to help Forever Knight to create a time portal with XLR8, he later turned back into Kevin a bit afterwards.
In the episode Growing Up is Hard to Do, Kevin Levin turned into Rush to fight against Ben as Cannonbolt, he later turned back into Kevin.
Rush also appeared in Ben 10 Versus the Universe: The Movie, where Kevin turned into him to fight and escape from Vilgax.
Rush also appears in the video game Ben 10: Power Trip, to help Ben fight against Hex.