-M. Bison / SFII series
-M. Bison / SF Alpha III
-M. Bison / SF EX series
-Gil / SFIII series
-Omega Rugal / KOF 98
-Shin Akuma / Marvel Super Heroes VS Street Fighter
-Eyedol / Killer Instinct
I'm trying to remember bosses on games other than fighting games, but I'm having a hard time on that
lol I just looked at my own avatar and remembered:
-Nightmare / Devil May Cry
-Nelo Angelo on the third fight / Devil May Cry
-Jecht / Final Fantasy X
-Adel / Final Fantasy VIII
-Any of the Weapons / Final Fantasy VII