Vicious- as in Sid Vicious my best characters are always based off musicians. Like my Bard based of Johhny Rotten who wass burned at the stake for screaming "God save the Queen!" one to many times.
(Mostly I DM, and the most important NPCs I play are villains, archmages, rulers of nations; the movers and shakers. These people got where they were by force of arms, sorcery, and ambition. When they set themselves to something, very little gets in their way - except PCs.)