General Grievous! The final element of the separatist army is of course its leader. Grievous was a kalee that swore to destroy the Jedi after they prevented him from genociding a specie of mantis like aliens, that had invaded his planet and killed his grilfrend. The droid body housed his heart, lungs and part of his brain, and allowed him to wield upt to four lightsabers at once, and sustain tremendous wounds. He was also armed with an uncivilized powerful blaster pistol. Despite his cowardice and apalling performance (was captured by gungans of all people!), he's my favourite baddie character of the Clone Wars. You just gotta love his evil aspect and that malevolent laughter followed by the iconic coughing!
The model looks a bit wonky because it isn't designed to have a cape and four arms at the same time, so I had to tweak him a bit in order to fit all the parts