This is the 200th episode of American Dad, which is also why its called the 200. Roger on average is at least in one costume an episode.. give or take episodes where he wears multiple outfits or wears previous outfits. Given this, its safe to assume that roger has had at least 200 personas since its the 200th episode. We the audience are suppose to assume that there are 200 but the animation team unlikely researched and drew every single costume. they just show about 50 naming themselves then show them fighting.
There have been reports that there are quite a few personas missing. For instance, Laura vanderboobin, the persona that got sexually harassed for money does not make an appearance. So we can assume its offscreen, but the episode does not at least draw or animate all 200 in the scene.