I like Starlight. Another pony given a second chance at redemption. Her and Sunset were both total bitches until they learned about friendship. I'm not really sure what motive Sunset had to become evil other than her simple desire to have more power - a classic. But Starlight's motives were kinda well, sad. But on the other side, they were kinda dumb. Having your best friend earn his cutiemark before you do - perfect excuse to grow up and force all the ponies in a village to not have cutiemarks so that everypony would be = .