Hmmmm.
It's tricky for me!
But my least fave is definitely Pinkie Pie. She annoys the hell out of my.

My faves are probably Fluttershy and Applejack. I like Rainbow Dash too, but she also irritates me. And I don't mind Twilight Sparkle, but she's too much the narrator for me to find her that interesting. Also, Rarity is interesting. I don't like her, but she's such a good impression of high fashion designers as I understand it. And the song 'art of the dress' is hilarious. So hilarious!