The Sociopath

4 vs. Satan:
*Satan, as always. Lack of Empathy? Finds using simple compliments insulting. Manipulation and lies? Uses mostly force and/or threats to get his way. The Hedonist? Plans to become God. Selfish? Yes, as noted. Pride? Again, he finds using simple compliments insulting and plans to become God.
*Jeremias may be not a mass-murderer, but he's pretty much this as well. Lack of Empathy? Doesn't give a damn about his allies' defeats. Manipulation and lies? Apparently, he uses his followers to go along with his goal. (All of them are defeated already before we learn about his plans.) The Hedonist? Plans to rule alongside Satan. Selfish? Yes, as noted. He plans to rule alongside Satan. Pride? Wants to be Satan's number two, ignoring the fact Satan is an even bigger sociopath.
Alex in Princess Quest:
*Malthor van Dracula. Lack of Empathy? Not even once gives a damn about his followers' defeats. Manipulation and lies? Uses his people as tools and views non-wizards and/or non-demons inferior. The Hedonist/Selfish? Plans to rule as the king. Pride? Again, views non-wizards and/or non-demons inferior.
The Stone of Power:
*Balthar is the only one so far. Lack of Empathy? Doesn't care about his own family. Manipulation and lies? Plays to be a good brother, but once Artimus fails, he gets rid off him. The Hedonist/Selfish? Plans to rule as the king. Pride? Shows confidence in his stone and when it's destroyed, he's pretty much doomed.
The Three Kingdoms
*While the minor villains aren't well-developed, King Vlados Palerius and Demon King Degares are pretty much this. Lack of Empathy/Pride? Palerius flat-out sees his people as tools, while Degares has low opinions of humans and when entering their battle form, they're eager to crush the heroes. Manipulation and lies? The former flat-out manipulates people, while the latter sees humans as tools. The Hedonist/Selfish? Both plan to rule the world and even to wipe out cities along the way.
Dragondawn
*The three dragons: Lack of Empathy/Pride? View humans as insects. Manipulation and lies? The red one manipulates one to work with him and sees him as a pawn. The Hedonist/Selfish? They plan to wipe out the entire world.
Harter Knall
*King Greyland. Lack of Empathy/Pride? Has taxes rised and executes others just to get rich. Manipulation and lies? Considering the S6 only work so they don't get offed by him and his forces, check. The Hedonist/Selfish? Plans to get very rich.
Hero Story
*N/A
Kill the Demons
*N/A
Satan Saga
*Meynard. Lack of Empathy/Pride? Kills his followers for petty reasons and wants to rule. Manipulation and lies? Gets along with Trianuk, but then brutally betrays him. The Hedonist/Selfish? Again, wants to rule. Plus, he laughs off at slaughtering an orphanage. Easily, one of the vilest villains in the game.
*Satan. Lack of Empathy/Pride? Gets along with his followers, but only when they're useful. Manipulation and lies? Kills Trianuk's wife so he can make him wipe out the world to avenge her. The Hedonist/Selfish? Wants to see people kill each other.
*Pope Bonmos. Lack of Empathy/Pride? Destroys a town for hating him. Manipulation and lies? Attempts a peaceful meeting, but when things go wrong, he imprisons and/or kills anyone who learned about his secret. The Hedonist/Selfish? Destroys a town for hating him and kills his people for being weak.
Story of Hero:
*Elizon Tataros is pretty much this as well. Lack of Empathy/Pride? Doesn't give a damn when he thinks his allies were killed. (Though, the heroes didn't kill them.) Manipulation and lies? Manipulates people to get along with him. The Hedonist/Selfish? Plans to rule the world and has his brother killed, so he can do so.
The Legend of Devils
*Satan. Lack of Empathy/Pride? Gets along with his followers, but only when they're useful. Manipulation and lies? Not seen doing this, but likely since he doesn't appear much. The Hedonist/Selfish? Plans to kill the other Gods so he can rule.
The Sidestory Duology:
*Ravydion. Lack of Empathy/Pride? Kills one of his second-in-command because he doesn't want to pay him. Manipulation and lies? Manipulates his allies and disposes one them with no remorse. The Hedonist/Selfish? Plans to do what most demons in his world failed to do: Prove himself superior to the good side.
The Time Of Bloody Fear:
*Maltros. Lack of Empathy/Pride? He does display some level of care towards his minions, but only when they're useful and had no problem in enhancing a demon just to kill the heroes, though this kills the demon. Manipulation and lies? Just look at the coronation scene. He fakes feeling bad for the old king being killed, even though he himself had him killed. The Hedonist/Selfish? Plans to rule the kingdom.