5. Neochu / XIII

His impaling attack does insane damage, his roar does too... heck when doesn't he do insane damage? And the Picochus don't make it any easier either.

4. Seymour Flux / X

I HATE this guy! He is pretty tough.

3. Dark Yojimbo / X

His attacks are just deadly, period.

2. Major Numerus / X-2

I didn't stand a chance when I first fought him. I survived like... 15 seconds?

1. Strongest Shinra / X-2

Hell. The only way I've beaten him yet is by using a Megalixir and a Miracle Drink, and even with those, I had Game Overs. Beating him is REALLY worth it, though.

(I haven't played FF I through VI so I can't really say anything about them)