Twilight

Twilight Sparkle is the primary main character of My Little Pony Friendship is Magic. She is a female unicorn pony who transforms into an Alicorn and becomes a princess in Magical Mystery Cure. She made Her Apperence in SADX: Happy (Already Forgotten) 2 Month Pi π day (3.14159265359...) Anniversary :P

Miles "Tails" Prower
The feelings between these to seems that they have a rivalry as seen at the beggining of her first apperence "SADX: Happy (Already Forgotten) 2 Month Pi π day (3.14159265359...) Anniversary :P" even though it was a cameo.

Apperences

 * 1) SADX: Happy (Already Forgotten) 2 Month Pi π day (3.14159265359...) Anniversary :P