I have no problem with expanding the universe and to be honest, if she'd had any other colour hair I probably wouldn't have minded as much.

But it IS a Buffy thing. Like they're all sitting around going "Okay we need a kickass chick. You know who was kickass? Buffy. Let's put Buffy in the show."

Well it's NOT Buffy. It's never going to be Buffy. So get over it and invent a NEW character.