He looks exactly like Upchuck, only with red eyes and no Omnitrix.
He stole some DNA, the first of the samples being Eon and . They overwhelmed him, so he took more. When he took the Het sample, he turned into Het! He also stole Nanomech and turned into a small Nanochip swarm. The DNA stealing is a side job, so his real purpose is to serve Paparo. That is, until he quit upon realizing Paparo's ultimate goal.
Original idea and picture credits go to Weirdo Guy.