"am working on a Homicide and Buffy crossover."
Erikaj, that is something I would like to read. Very intriguing possibilities in that regard. Crossovers are my favorite brand of fanfic.
I have thought about the dynamics of a Buffy/Batman crossover. Clearly, not your 1960s camp Batman, but your Frank Miller-Dark-Knight-Returns-he's-50-years-old-angel-of-vengeance-I-am-the-LAW Batman.
A problem that I have before I put words to keyboard to write fanfics is that my imagination doesn't keep me to simple xovers. I think three or four (at times five or six) different series and hopelessly grand epic stories. Because I see the conduits in each of my favorite tv series or literary works that allow for "plug-and-play" type storytelling.