Does nobody know the difference between Zemus and Zeromus? This makes me sad.

Anyway,

Most Accomplished-

Well...they all did alot of stuff. this warrants a spoilerChaos almost threw the world into chaos, the Emperor made the world a living hell, Xande summoned the Cloud of Darkness, Zemus tried wiping out all life on earth, X-Death almost sucked everything into the void, Kefka made the world a very unpleasant place to live in, Sephiroth almost got that Meteor to hit the planet, Ultima got revived, Ultimecia got everything Time-Compressed for the last two hours of gameplay, Kuja destroyed Terra and made the world all misty, and Sin wasn't too nice either.

So they all more or less almost accomplished their goals, so it's rather hard to decide on this.

Most Intelligent-
It would probably be the Lucavi from Final Fantasy Tactics. I don't know much about Vayne yet, but he may climb up the ladder soon.

Most Powerful-
Well, Kuja would win this one. He actually destroyed an entire planet. Even Kefka couldn't do that.

Best Appearance-

Obviously Zeromus. Can you argue with the blue spaghetti alien?

Best Motivation/Character-
It would have to be Sephiroth. I don't really care if he's overrated or whatever excuse there is to hate on him because you like Kefka better or something, I don't believe that degrades his quality of a villain or his backstory in the slightest.

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Least Accomplished-

Like the most accomplished, this is also tough to decide. They all accomplished alot in thier goals.

Least Intelligent-

I'll insert the Dark King here so nobody forgets Mystic Quest.

Weakest-
I'm sorry, but the Emperor of Paramekia wasn't too much of a toughie. Now all those Death Knights before him, on the other hand... :/

Worst Appearance-

Jecht was icky. Even Yu Yevon looked better than him.

Worst Motives/Character-
Ultima. The horrible translation of FFT can probably be put to blame for this, or for Ramza's inability to read any faster than a snail so I can actually discover why the Germonik Scriptures were so important.