Penny: Penny is going to be there at the Battle doing all sorts of Ordery-stuff. She could start warding tunnels as the younger students are led out and putting up trip wards around some of the entrances to the tunnels etc.
I'd be completely up for having her be hurt/attacked by a stray DE. No death though as that would be pretty hard to explain to Ol/Meghan/Orsino.
Pansy Will do the whole 'Handing Potter over' because its for the greater good. Seriously - she says - one speccy eyed skinny boy for everyone else? She's also happy to leave/stay whatever - but she doesn't want to find herself at the wrong end of her brothers wand. Thaddeus is not the nicest of Parkinson's.
Oh and as for the reboot idea, I am perfectly happy with that idea. I think it could be really good fun and hey, it worked for Desperate Housewives.