I see half of them also as Mario characters and half as Sonic. Twilight/Blaze: New girls,purple,a bit unsocial,can use magic,calm,culturated. Pinkie Pie/Amy Rose: Funny,pink,a bit childish but cute. Applejack/Cream: Has a big family,orange,always to help her friends.
Fluttershy/Peach: Caring,loving,pink and yellow,graceful. Rainbow Dash/Daisy: Tomboyish,tough but friendly,colorful and rowdy. Rarity/Rosalina: Motherly,the eldest (i think Rarity is the eldest of all ponies and Rosie is the eldest between all those Mario/Sonic girls),elegant,fashionable,a bit dramatic.