I was even going to say Eddington but left him off. He was viscious and smart. The dialogue between him and Sisko was some of the best!
Though my favorite scene has to be with Weyoun, Gul Dukat & Sisko. Where Weyoun drinks the poisoned Kanar. One of the greatest scenes ever!








Clownican - DS9 was also my favorite Trek, actually. My favorite antagonist on the show was probably Eddington, the guy Starfleet sent to take over STARFLEET security's presence on the station after they found out that Odo was a founder...and then it turned out he was the leader of the Maquis. Love the episode where Sisko had to become the villain to catch him...that's how I learned the basic plot of Les Mis...LOL
Fun Fact - Ken Marshall, who played Michael Eddington, was the guy who played Colwyn in the 1983 fantasy guilty pleasure of mine, "Krull."