I have a love/hate thing about Umbridge; she's the quintessential baddie, enjoying what she does and not a shred of goodness in her. My favourite part of the fifth movie were all the scenes where we see her cheerfully oppressing the students -- but as far as good fiction goes, I wish she never existed.

That always happens to me with long, epic stories. :D I'll spend the entire time going "main character, whatever. Are we going to see that awesome guy from chapter five again?" (Then again, it seems I always like minor characters more than main ones. ^ ^;;)