Killer SF protagonists? No, literally.

Right, help me out. I'm looking for science fiction, preferably modern (1995-2011), which features the most insane, homicidal nut-jobs you can think of. What I'm really after is something like Hannibal Lector meets Takeshi Kovacs. Anyone got any ideas?
YES !!! Time Wars by Randall Miller the protagonists in that story is very demented, he's a on the field battle general who takes great pride in being very brutal read the whole thing and you won't be disappointed. available at I highly recommend it !!!