Darth Nihilus

Darth Nihilus is a Sith who enjoys eating people's souls. In fact, he is very good at it. He consumes entire planets for a living apparently, so it's a wonder how some Guy is able to just defeat him in their first fight, which lasts only two minutes.

Nihilus cannot talk by himself so he teams up with Darth Cryer to let her do the talking. It doesn't do him any good, as people are always misunderstanding him.

Rumour has it that Darth Nihilus himself is in fact the mask, and the body is merely a host who was unlucky enough to put on the mask and was thus possessed, forced to do evil things until the mask drains their power, leaving them a husk.