User blog comment:The Nemesisx/Who is the best Primary Antagonist/@comment-422853-20111007065142

For me, it was definitely Onaga. Not only did his existence as a previous emperor give us more insight on Shao Kahn's past history and that of Outworld itself, but it was something Reptile's constant changes throughout the games built up to as well, even though they became separate entities in Armageddon. Plus he had that whole army which he could constantly resurrect at will, and with Shinnok's amulet and the Kamidogu which he attained through clever manipulation, he became more of a threat than Kahn and most of them could ever hope to become. Need I say more? Simply being a dragon (and a dragon king) was kind of a plus too, since I felt that species of creatures was something the MK universe needed more of besides Liu Kang's animality.

And you were right not to include Blaze, since he was just a tool that was doing his job in accordance to his creators' will, and Dark Kahn shouldn't count of course.