I love them all, but I think that Fluttershy is my favorite. I adore Pinkie Pie and Rainbow Dash is AWESOME, but Fluttershy holds a special place in my heart. But the main reason is that...I admire her strength. Most of the time, she holds back so much that she comes off as weak. But when shit goes down, she goes from being a soft breeze to a full-blown hurricane. She drove an enormous dragon to tears with a lecture, the (literally) petrifying gaze of a cockatrice was no match for The Stare, and her hospitality touched Discord so deeply that when she finally rejected him, he willingly reformed in order to save their friendship. All that takes true strength.