From the official Hunters website:
"Once a powerful space pirate general, Weavel was critically wounded during an altercation between the space pirates and Samus Aran. With just his brain and spinal cord still functional, his body was fused with a mobile life support system."
The jokingly named Weavel can form into the Half-Turret, which looks to swing around and kick a lot. The other half acts as, get this, a turret. When he's not hanging around looking like Master Chief, Weavel tends to pull out the Battlehammer, an energy blast that blows up real good.