Rulan Prolik

Rulan Prolik was a shapeshifter and Overseer of the GenoHaradan in 3,956 BBY, during the Jedi Civil War.

The identies of the four GenoHaradan overseers were meant to be kept a secret, even to each other, but Overseer Hulas managed to discover that Prolik was one of them. Hulas then enlisted Revan to assassinate him, claiming that Rulan was responsible for several deaths in the Outer Rim and would most likely move into the Core Worlds and wreck havoc on the Galactic Senate itself.

Powers and Abilities
Overseers of the GenoHaradan were mysterious by nature, but Rulan's shapeshifting abilities placed him in a different league. Few knew of his identity as an overseer; fewer knew his species, or even whether his power was a natural ability or an alien technology. His skill in assuming a target's identity was uncanny--to the extent of knowing what phrases his target would say before they said them. Rulan could assassinate someone, assume their identity, and convincingly maintain the identity for long durations of time.

Rulan's shapeshifting was no mere illusion; he could actually take on the physical characteristics of whomever or whatever he changed into. There was some level of restriction to this power, however: while he could use claws or other natural weapons of creatures he mimicked, he could not successfully wield a lightsaber or connect with the Force in the way a Jedi or Sith he is mimicking might have.

If Rulan was a changeling, he was a powerful breed, and their are some shapeshifting species that can be eliminated, such as Clawdites, who cannot change their body masses. If Rulan's powers were derived from synthetic machinery, then it was the type of technology that was destroyed upon his death, with no trace left behind.