1. Rarity : even though it can seem like she's really selfish sometimes, she always comes around and will put her friends before everything (telling Twilight to give her ticket to somepony else, making them personalized dresses and re personalizing them when they hated them and not hating them for hating them, sacrificing her fashion reputation to make her friends happy, possibly sacrificing her Canterlot reputation for her bids etc) even if it is after learning a lesson (like with Rainbow and Sweetie). She has good intentions and I can relate to her analness, artisticness, and I like watching her dramatics. And you can still be fashionable and glamourous while taking care of yourself (not that I am...) Her with Tom was funny.
2. Twilight Sparkle : she ties for first with Rarity in my head. I like her booky anti-socialness (like me). Lesson Zero was me to a tee. I have nightmares about assignments and lateness and the human equivilant to magic kindergarten. She's also kind and practical which I love. And she's great with magic and can't do normal pony things too good (like me!).
3. Fluttershy : I like how she's sweet and an animal hoarder. I've seen her farm. Waaay too many pets. She'd be on the pony version of Hoarding: buried alive. And I like her squeeky scared of everything ness. We both have this trait where we're all meek and quiet until something sets us off and then we're scary. She's a cool pony.
4. Pinkie Pie : crazy nut. I love her randomness and how the rules of normality (the laws of physics probably wouldn't apply to her either). She's all over the place, usually perky, has hair with a personality, has an alligator for a pet, does not follow the rules of conversation, is not normal at all, and was a rock farmer in a past life. Go Pinkie!!
5. Applejack : I think she's underrated but I think she's the least pony of all the ponies. I like how she's honest, sensible, loyal and a workaholic. Don't rest until the job's done! If I had to be a buddy with any of the ponies it'd be Apple. I think she'd be the most likely to feed me lunch too.
6. Rainbow Dash http://mlpforums.com/public/style_emoticons/default/dry.png : I like her but I think she's overrated sometimes. For some reason, even though Rarity's amongst my top favorites I think she and Rainbow have similar personalities but one's girly and one's a tomboy. I think that they are both selfish at times, obnoxious, overdramatic, overly concerned with how they are perceived, overacheiving etc, but Rarity just seems more welcoming, friendly, polite and well generous. I think Rainbow's learning and hopefully after the episode MMDW she'll learn to be less self obsessed and stop trying to be so cool and maybe be a bit more sensitive to how her friends are doing (not very nice about Fluttershy in Dragon shy).
But I like when I can see her heart, when she stops being so tough and is just a regular pony. Like in MTBPW when she's stuck, and when you can tell that she really respects Tank, or in TSRB when she's nervous before her performance and saves Rarity even when she's being obnoxious. I think she's the cutest pony.
One thing I'd have to ask is if she's a better flier than the Wonderbolts, has saved them on many occassions, and is the only one who can do the SRB why haven't they asked her to join them yet? Are they scared of her?
K... I'm done with my 8 page pony thesis paper