I say neutral, for a lot of reasons that have already been said. Riddick strikes me as the type of guy who doesn't go looking for trouble... trouble finds him. He's definitely not a nice person by any stretch of the imagination, but he doesn't go out looking to hurt people or even to make his life better at the expense of others. He doesn't feel remorse for killing, but he tends to only kill the bad guys anyways.
My gut instinct also tells me that he is a career criminal by circumstance, not because he is some heinous monster. The only people he did more than threaten without being attacked first were the Necromongers. In both PB and CoR, he used words (threatening and violent as they may have been) to try and dissuade anyone from getting hurt whenever it was an option. That shows me a respect for life. He doesn't take life on a whim, he just doesn't hesitate to kill people when it's necessary, and he doesn't angst about doing what he was forced to do after the fact.
Yes, Chaotic Neutral.
My gut instinct also tells me that he is a career criminal by circumstance, not because he is some heinous monster. The only people he did more than threaten without being attacked first were the Necromongers. In both PB and CoR, he used words (threatening and violent as they may have been) to try and dissuade anyone from getting hurt whenever it was an option. That shows me a respect for life. He doesn't take life on a whim, he just doesn't hesitate to kill people when it's necessary, and he doesn't angst about doing what he was forced to do after the fact.
Yes, Chaotic Neutral.
