Moving on:


FF VII - Safer Sephiroth


Ultimecia - FFVIII


Necron - FFIX


Braska's Final Aeon - FFX


Vegnagun - FFX-2 (Sorry, can't find a better picture. It's just a dumb looking robot anyways)


Shadow Lord - FFXI


Dark King - Final Fantasy Mystic Quest


Altima - Final Fantasy Tactics

And just for the hell of it, I'll throw in the SaGa/FFLegend bosses.


The Creator - Final Fantasy Legend


Arsenal - Final Fantasy Legend 2


Xagor - Final Fantasy Legend 3


Julius - Final Fantasy Adventure

Sorry I don't have FFTA or Crystal Chronicles up here. I either haven't finished them yet because I'm lazy, don't want them spoiled for myself, or both.