I have played psychopaths before, but in my RP, ParaCom: Adversary Uncertain, so far my Kalleh-e Marg (Head of Death in Farsi), is the primary antagonist who is a mixture of Victor Frankenstein and the Joker. His introduction and first evil moment is:

[quote=Ubermensch]
The barrage worked! William's ploy slew the manticore instantly. Xavier and Charles worked in tandem, with Charles' knife hitting the manticore in the gut and Xavier decapitating the monster. Both Goliath and Lazar were able to stab the last manticore to its death. Alina and the captain worked in helping the group free the civilians. The Iranian captain was able to gather the civilians back to the drop ship, with Alina coordinating before sticking around with her group. All of a sudden, after the mission was accomplished, knockout gas seeped through the vents. Lights were activated and through a windowed area, the group can see someone with a very toothy and wide smile. He didn't look like any Iranian human at all. An otherworldly wrongness was visible at a close distance. "Look what we have here! Very valuable specimens from ParaCom! I have a surprise for you all, AHAHAHAHAHAHAH!" The basement was sealed and the group would be knocked out cold within a minute.

Sometime later, the whole team were shackled. "The terror mission was planned just to lure you all here! Because my operating table has room for one experiment and I feel merciful, I will let you vote among yourselves. Vote and tell me who shall I...dissect! I will defer to any of your choices!" The man was a mad scientist, but not human whatsoever. An ex-human at least. The white room was designed to be maddening for short periods of times and he did not look one bit promising.
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Everything in the RP involved the heroes beating down on paranormal and supernatural forces. Then my villain arrives and the RP takes a horrific turn.

[quote=Ubermensch]
"Two volunteers! WONDERFUL! I will have a hard time deciding between both of you, so I'm going to wait for your friends to vote. I have patience. Plenty at that too. I can wait for minutes, hours, days, until my job comes. I have nothing to lose myself, for now. There's nothing you can all do and I already locked the doors so nobody can come in...or out. Take your time, folks! One of you will contribute to the science by me...Head of Death...or as properly said...KALLEH-E MARG!"

It was, for the first time, a dire situation for the squad. Damned if they did and damned if they didn't. Either way, Head of Death was not very encouraging. His mocking veneer of politeness was contributing to the horror of the room. Alina was silent, defiant at that. She would spit in the direction in the madman's face. "Oh, we have a feisty one here. I'd like that. Still, I'm waiting for the final result. If a tie is indeed reached, I will flip a coin. Head for the first man, tails for the second man! Even if your group sends a rescue mission, I have preparations. This won't be easy."
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Our heroes refused to vote and tried to escape as two offered themselves up. So far is the tip of the iceberg! For the moment that disgusted a few players:

[quote=Ubermensch]
William's and Xavier's attempt to escape both failed. Xavier's hands were too big to slide out. William noticed that the lock could not be picked by the knife as it was a tube lock, which required a drill to destroy.

The mad scientist saw the escape attempts from William and Xavier coming. "Just so you know, the shackles are made of solid steel and the locks are of the tube type! I shall now flip a coin!" Head of Death flipped a coin. The coin landed on heads! "Sorry Mr. O negative, you will not be dissected today. Your friend who offered first shall be the sacrificial lamb!" Head of Death then would throw Lazar onto an operating table. The dissection was quite horrific. First, the madman thrusted his scalpel into the eyes of Lazar in order to take them out, leading to another horrific procedure. Then, via a drill and vacuum tool, the skull was then penetrated to have the brain sucked out into a jar. The other organs followed suit and surprisingly undamaged into the jars.

"Count to four, inhale. Count to four, exhale." Alina was coping with the horror and tried to help others do so too. Every ParaCom squad member was to witness the horrific dissection. It would also be a source of tragedy for all of ParaCom, but Center will make sure this never happens again.
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More to come from the brutality. Context and reaction scenes are [url=http://www.roleplayerguild.com/topics/51051/posts/ic?page=7]here.[/url]