Darth Maul, T-Bag, and the jailbait from 'Californication.' Excellent additions.
I'm not familiar with Deanne Bray's work, but I'm sure her superpower (if she's one of the Heroes) will involve something that plays off of her deafness, like taking the enhancement of her other senses to an extreme degree. Not because I think that's a great idea, but because 'Heroes' usually takes the obvious route. Or they'll make her like Banshee with a sonic scream.
If T-Bag is a Hero, I'm almost afraid to ask what his super-power would involve. While having him play a good guy would go against type, he's such an awesome villain that I can't blame them for using him in that way.
They better use Park to do some kickass fights and not tease us like they did with Peter vs. Sylar for three damn seasons.