Of course, with an undertaking as huge as checking every character in every game ever, this data of Williams and company comes with a few caveats. First of all, the census went down in February of 2006 and has only surfaced recently thanks to NewScientist. Second, the only systems and games combed include the top 150 titles sold on Xbox, Xbox 360, PlayStation, PS2, PSP, GameCube, GBA, DS and PC. Still, it's a lot to sift through and -- when the dust settled -- Williams and the gang came up with a couple of charts and some data to back up their claim.
[Via Game Politics]