Final Fantasy 7:
Jenova Life, Jenova Death, Schizo, Diamond Weapon, Hojo, Seraph Sephiroth.
Final Fantasy 8: Griever
Final Fantasy 6: Kefka
World of Warcraft: Heigan the Unclean, Thaddius,
Shade of Aran, Al'ar, Illidan Stormrage
Kingdom Hearts: Second Riku, Ansem
Kingdom Hearts 2: Every member of Organization XIII
Sonic 2/and Knuckles: Death Egg
Sonic Adventures: Perfect Chaos
Sonic Adventures 2: Final Hazard
Tales of Symphonia: Origin
Metroid: Any and all incarnations of Ridley and Meta Ridley
Zelda OOT: Barricade, Volvagia,Twinrova,
Ganon
Zelda MM: Lol all of them 8D
Zelda TW: Gohma, Ganon
Golden Sun: Satauros & Menardi
Golden Sun 2: The other couple I can't remember the name of right now.
I couldn't pick just a few
.