I know Prairie Dawn gets a fair bit of love here, and as you can see in my sig she's one of my top four characters, but I get kind of annoyed at how underrated she is. I mean, outside of our fandom, few people ever mention her. Also, most people don't even know that Kate Monster from Avenue Q was based on Prairie.
Also, I don't think The Count is a very strong character. I mean, I like him just fine, but there's not really much you can do with him; which would probably explain why the writers hardly use him these days.