John Scalzi asks: Is Pac-Man a mammal?
Well, obviously, no, he's not, so far as we can tell from the evidence. There's no hint that Pac-persons nurse their young, and one of the cartoons in Ms. Pac-Man clearly establishes that Pac-babies are not born to Pac-persons at all, but are delivered by Pac-storks.
Pac-people are not mammals. So what are they? Who knows? He didn't ask that!