Quote Originally Posted by The Crystal View Post
To me, the worst is Zemus. It's hard to feel anything about a character that appear for a few seconds in the end of the game, fight you, and die. And he don't have the excuse of "possesing Golbez's body" like with Ultimecia/Edea. He never was present in the story, it was all Golbez with an "evil personality" if you understand what I mean.

Other villains like Zemus are Yu Yevon and Necron(he is the worst).
Zemus isn't the only one though, and Necron is a brief "FF-throwback" at the end.

Most FF main-villains remain unseen until the end of the game, but they are directly controlling all the events that take place throughout the course of the game. Chaos, Ultimecia, Xande and Sephiroth also fall under this category, I would put Yu Yevon in there also, as he is the actual villain, the rest are to tie up the loose ends of the story. To me that's just the style FF assumes in many cases, so I wouldn't call Zemus the worst for that reason.