Most Interesting / Strongest Final Fantasy main antagonist?

I chose Artemecia. (thats what the name Ultimecia was based on)
Because even when capped, she can still pwn your ass. How? well
if your not spamming lionheart or not having that kind of sword nor those heros/ holy wars/ invincable buffs..

She can be a b*t*h, she can still own ya if your not careful.

Kefka was easy, so was sephiroth, so was Kuja, I only faught Kuja a couple times and he was easy, even for my first try. XD
Dunno why he has high rating, same for kefka. Sounds like popularity, but meh. XD

The reason they're rated so high is not the "strongest" factor but the "Most interesting" factor. Plus, this is a forum based on hacking Final Fantasy VI. Did you expect Kefka NOT to lead?