My top 3 are:

1. Hiro Nakamura (He and Ando should get their own sitcom!)
2. Claire Bennet (She's so pretty)
3. Peter Petrelli

How about you?

Hiro
Claire
Matt

Hiro
Matt
Mohinder

Noah Bennet aka HRG(this guy is so interesting that he doesn't even need a power,he is an awesome character)

Peter(I love his powers and he's very handsome)

Hiro(he's adorable and so funny)