Tough between the Karda-Makuta, Barraki and Piraka. The Barraki's back story was awesome, and the Makuta were powerful and the only members of their species we had seen since Terrdax. But I give it to the Piraka. The Makuta were all killed off and we never got to know them as well as the Barraki or Piraka, and the Barraki while deadly and powerful, IMO were just not as good as the Piraka, or as Nostalgic. As well, their past was one of the best stories in Bionicle. Zaktan was right up there with Teridax as one of the best villains, and I have liked them the most ever since Legacy of Evil.-Star