As the title says, everypony has fears, but what are the main 6 afraid of? For Twilight, I think what she fears the most is not living up to other pony expectations. She needs to do everything perfectly to the point where she would do anything and everything to make ponies accept her. For Applejack, it's pretty similar to Twilight but it goes towards her pride and her family (including her friends). She's pretty stubborn and she won't admit being a failure that easily. but to be honest, I don't know that I could call it 'fear' of her or so to speak. For Fluttershy, this one is tough, she fears mostly everything but I think the fear of her, is fear of facing the problems. She always hides when everything went south. For Rainbow Dash, it's easy. She afraid of losing, not even a small thing. She's afraid to lose yet she gets nervous every time she had to do something big. For Pinkie Pie, her fear of losing friends is noticeable throughout the show. She desperately trying to get everyone attention and also pay her attention to everypony equally. She's sad when her friends didn't like Maud yet she didn't have the heart to tell them. Even though it was pretty obvious. :okiedokielokie:
For Rarity, she's pretty hard to think of. She might be afraid of losing her chance to go big. She did mention a lot that she dreams of being important. I'm not sure at all. These are my thoughts, what about yours?