The Ultimate Evil

Similar to "Complete Monster" and "Big Bad", but basically THE most awful and the pinnacle of evil.
4 vs. Satan:
*Satan.
Alex in Princess Quest:
*Malthor van Dracula.
The Stone of Power:
*RM: NONE. Artimus is an Anti-Villain, while Balthar didn't cause the plot.
The Three Kingdoms
*Degares.
Dragondawn
*The Blue Dragon.
Harter Knall
*King Greyland.
Hero Story
*Shevu.
Kill the Demons
*Casper and Rustoc.
Satan Saga
*Satan
Story of Hero:
*NONE. While Elizon has the potential, the Grimoire is more vile and powerful than he is, while the Grimoire only appears at the end as a character.
The Legend of Devils
*Satan
The Sidestory Duology:
*Rudolf Hitler and Ravydion.
The Time Of Bloody Fear:
*NONE. Maltros influences most of the plot, while being outplayed by the more powerful Moses, who only serves as the main villain for the third game.