Mr.Myoozik
Music Connoisseur
Boast Busters, Look Before You Sleep, The Mysterious Mare Do Well, Putting Your Hoof Down, Dragon Quest, Babs Seed, Princess Spike (my least favorite episode of the entire series), 28 Pranks Later, Newbie Dash, Yakkity-Sax, All Bottled Up, A Matter Of Principals, 2 4 6 Greaaat, A Flurry Of Emotions. These are the ones I can think of from the top of my head.