While replaying Radiant Dawn, I've been reminded that Zelgius might just be the most badass antagonist (at least for a while) in Fire Emblem history. He's calm, he's clever, he's powerful and he's the only character in the game with a good English voice actor. Every time he's shows up it means bad news for Ike and the gang. I never felt that way about any of the enemy generals in Awakening. They were incompetent flunkies who's only jobs were to be cannon fodder mini-bosses. Even the enemies that were important to the plot like Gangrel and Validar were a pair of easily outsmarted idjits in the end.
Why didn't IS give us a antagonist on par with Zelgius? I wanted to see a bad guy who could Robin a run for his/her money show up, but they never did.