Fantasy is my #1; I will give almost anything a chance if it has strong fantasy elements. Post apocalyptic, superhero, alternate history, science fantasy, some supernatural, romance, and a few fandoms (especially Game of Thrones) are also likely to catch my eye.
The hope is that banners will work again some time in the maybe near future. There's no real timeline for it, but as I understand it it's a high priority thing for the admins.
Specifically, @Diana has been working on the banners in an attempt to separate libertine/teen ads based on the viewer's account age and libertine preference. Due to bugs, though, they aren't playing nice. But it is certainly on the todo list.