Actually both of those characters are from console exclusive titles I believe...
I also think that was an intentional choice (although now that I think about it niether of them are on games on the Xbox... hehehe)
After reading this I checked the debates that were on the comments of the previous comic. I've always been a console gamer my self, but there are certain types of games I feel are better on the PC and I actually have had better multiplayer experience with my PC games then with my console ones, so I usually buy games on the PC I want to play with friends and games on my PS3 if its a single player game.
For me it comes down to voice chat. I don't like using voice chat systems on console games... they never work for me. Having the option to use Skype or vent is not only free, but better.