10. Martin Riggs - Mel Gibson - Lethal Weapon
Riggs is a man with nothing to lose, basically because he lost it all already when his wife was killed in a car crash. The deep-seated sense of guilt that he feels for not having been there has warped his mind to the point where he doesn't care about living or dying. This is obviously sad and terrible. But on the plus side it gives us one of cinemas most iconic mad dogs right off the bat with a good back story which really makes us sympathize with the character. His semi-suicidal despondency gives us some awesome and comedic action moments and gives him a massive edge on his rivals, often with explosive consequences.