HOYT VOLKER:
Hoyt Volker appeared to be a sadistic, vicious, emotionless, deranged and mentally unstable psychopath who was shown ruthlessly torturing and executing innocents and was the main reason for the Rook Islands' endless turmoil that has taken the lives of many of the island's residents whom Hoyt despises for an unknown reason. His crude and bloodthirsty nature is further shown when he makes the remaining survivors in Beras Town to run across a rice field, filled with landmines, when he asks "Foster" to interrogate Riley for information and the brutally beat him up until he can't stand, when he ruthlessly kills an unsuspecting Sam and then makes a crude joke out of it by saying that he is sitting this game out and when he blew up a boat, full of hostages (because the customer would not negotiate outside country lines) and laughed maniacally at this murder act while listening to "Ride of Valkyries"..



VAAS MONTENEGRO:
What is known about Vaas' personality comes from his close (and dangerous) encounters with the main protagonists. Close observation shows that he is a reckless, violent, sadistic, brutal, unpredictable, cynical, machiavellian, psychopathic, insane, extremely prideful and remourseless pirate lord with a dark sense of humor and a frighteningly violent personality who is feared even by his own men, some of whom are as chaotic and psychotic as Vaas..



BUCK HUGHES:
Plain and simply, he is a psychopathic pervert who enjoys torture, rape and murder. He is not out of his mind like Vaas is however. In fact you never know how truly dangerous he is.
Unlike Hoyt and Vaas you never know WHAT kind of person he truly is..


#4: PEGAN MIN:
Very calm and collected.
Even when violently murdering people.
And he is hard to predict..