Well, it wouldn't make sense for everyone in the game to be someone Jazz knows personally. Look at JJA, that had lots of random secondary characters (held captive by the Saurians, I believe), and that never gave the impression that it starred anyone other than Jazz. Besides, as long as the creator didn't go overboard with the characters (this guy shows up in the background of a bar once in the game, but I gave him six pages of backstory, five different weapons and the coolest outfit ever!"), there's no problem with creating rabbits or whatever.