Boba Fett seems like a good addition to me but I think Hiro Nakamura is far more of a breakout character for Heroes and you just glossed over him  Hayden Panatierre may be on the covers of magazines she is a photogenic young lady but almost every article I have read regarding Heroes has mentioned Masi Oka and a fair number of them have been about him exclusively  That said I am not sure that either of them are true breakout characters  While the Petrelli storyline is central to the story both characters have had a great deal of screentime from the very beginning and I dont think they were ever intended as minor roles