Personally, probably Turok from the recent game of the same name. Because I have serious issues with how he responds to animals that are defending their territory.
Also, I don't know what it is about him, but every time Dante from Devil May Cry speaks a line of dialouge I get this incredible urge to punch him repeatedly until his face resembles a squishy mass of flesh and broken teeth.
Also this will come as no surprise given my hatred of the human race but I would like to not only beat the living hell out the so proclaimed 'Emperor of humanity' but I would like to skin him alive, pour boiling water over his skinless still screaming body, cut open his stomach, yank out his intestines and feed them to the Kig Yar. Then I would cut off his head and parade it around in triumph.
And I would make all the Space Marines watch as all their foolish human ideologies crumble into pathetic little pieces and they succumb to their own destruction much to the relief of the galaxy and never again do I have to hear:
"FOR THE EMPEROR!"
Every bloody time I look through my space mailbox.
[sub]Oh boy, do I have issues or what?[/sub]