Fans who are welcoming and want to have a community. WC fandom is awesome, and we develop that community by having different challenges and through chat and meet-ups. Not all fandoms have that, so I definitely look for those things.

I also need the show to have elements of drama and humor - I want it to be fun to watch and also fun to write. And the characters have to speak to me in some way. That's definitely a more subjective thing, but it's very important.

It mostly boils down to fan community and good characters :D