I don't even consider her a main character. She's only going to be with us until the story moves away from the Void. I honestly don't see how some people think she's gonna be permanently around, save for the odd MSQ here and there.

Besides that....I have no problem with Zero. I did feel her changing over the course of the patches was too fast, but I'm overall happy with her and I'm looking forward to finding out more about her.