Solid Snake. Hands down this dude should join the Joes and get it over with ;-)

Ryu

all the characters in the KOTOR series were GREAT.

the rabbits from the Raving Rabbits series are just hilarious.

Matthias Nilsson from Mercenaries. I mean, come on, the dude is voiced by Peter Stormare for cryin out loud.

Sam Fisher of Splinter Cell fame, voiced by one of my favorite actors and a Canadian to boot, Micheal Ironside.