Sounds like Radioactive Man (is his name like... TED because that's a long name to type) and Technopath Girl have been recruited for the bad guys. Anyone encouraging him to go BOOM! is not a friend. Nathan may get wrapped up in trying to stop his brother/help his campaign, but I don't think he'll intentionally do something like help Sylar.
The Haitian has taken a lean towards the good IMO, he works for HRG, but has disobeyed once and probably would again, particularly for the right reason.
Invisible Man (who's a former Doctor from Doctor Who I think) looks like he's supposed to be good, even if he's a bit touchy right now
Jeez, how do I write so much?