Talk:Pinkie Pie/@comment-76.95.200.26-20130112063615/@comment-3218812-20130119211132

If you think about it, this does make sense - Twilight and Rarity (unicorns) are more "serious," Rainbow Dash and Pinkie Pie are more "wild" and Applejack and Fluttershy are more "down to earth." Switching Pinkie Pie's and Fluttershy's races would have paired them better to those characteristics, but the creators probably noticed this and wanted to mix things up a bit. Surprise does seem to have a fanbase, though, so I wouldn't be surprised if she showed up in an episode as a development gag.