Sephiroth x 3[Kh2 a bitch 1,000,000 times. easy later]
[kh1 a bitch but easy after u know the moves]
[FF7 a bitch never beat regularly use special move constantly]
Zeromus[never really beat on any platform except GBA]
Necron[ff9 last boss very tough no matter what]
kefka[extremely epic fight, awesome background music
]
U3[RE4 actually very easy fight but be4 that]
Nemesis[FF10 longest fight in the game, require 255 everything except luk]
thats all for now.