They don't add anything to the show. Now that Fuller is back, the writing is witty rather than painful, but that's true across the board. Other characters have witty lines and if Hiro and Ando were gone, the other characters could take up the humor slack. It's not like Hiro and Ando are writing the comedy after all - it would still exist without them. Which fangirls? I'm more convinced than ever that my theory above is going to come true, because of this little tidbit from Ausello: Spoiler: spoilery hint about finale That tears it. Quinto is going to be sharing Sylar as a charcter with another actor, who will be playing some melding of his original character and Sylar, and the only character they've done enough setup for this to happen with is Nathan. Nathan will die for good, but Pasdar will remain a regular. And in the end, it's Quinto who will probably lose 'control' of Sylar, but that will go well into next season which could be the last anyway. I can guarantee that there are fangirls who will be hunting Bryan Fuller down with pitchforks and torches because even if Spoiler: my speculation which at this point is 99% certain to be a spoiler Sylar metamorphoses into Nathan "for real" - having both Nathan's DNA and memories - there will be a militant camp who will insist that Petrellicest has been ruined for good because Fake Nathan is no substitute for the real thing. But I'll be ecstatic. As a longtime, voice-in-the-wilderness advocate of Pylar, with no objections to Petrellicest in the least, I get to have things both ways. And it's an ironic wrap-up to that idiotic Gabriel Petrelli plotline this season. I'd thought they'd left that nonsense in the dust, but looks like Fuller has found an interesting use for it after all. The internet fracas that will break out is one of the reasons I want my theory to come true. This will make the ENT shipper wars look like a tea party by comparison. And although I don't mind them killing a character just to be rid of him, if you're going to kill someone in a season finale, it should be because that one character is the best one to kill for the sake of the story. If my theory is correct, this show could go very interesting places.