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Kain, Cecil, Golbez
Duplicating Excaliburs
FFIV by far

No, but really, FFIV was the first of the series I played and it got me hooked.

If you try and go after the marks when they become available, the Gil Snapper is way harder. I beat them both and I'm lvl 18. The ring wyrm went down pretty easily:
...

I beat the demon wall at lvl 17, although it took me a few tries.
My basic strategy was this:
-Make sure battle speed is HIGH - the wall won't come any faster, so you'll get more turns in.
-Equip...

He took me 2 tries, but wasn't that difficult with the right strategy.

First, I made sure to blind the Ring Wyrm. And slow him, too.

I had Vaan with the Main Gauche + Golden Shield (Evade = 50)...