Wow, I can't believe how close it is between Mac and Frankie at this moment!
well, I'm pretty sure that I voted for Frankie earlier, but really it was a hard choice because I like her, Mac and Madame Foster almost the same (well, I like Madame Foster in the earlier seasons, anyway! I kinda don't like what they did to her in episodes like "Foster's Goes to Europe" for obvious reasons).