Well, Saving Marty isn't a graphic novel. Usually, a graphic novel has a lot of illustrations and visual elements, but Saving Marty doesn't have those typical features.
Doc fiction could refer to fictional works presented in a documentary - like style. It might blend elements of real - world settings and facts with fictional characters and storylines. For example, a story set in a real city but with made - up characters and events.
I'm not sure who Marty Markowitz specifically is. There could be many people with this name. Maybe he's a local figure in a certain community, an entrepreneur, or someone with a unique personal journey. Without more context, it's difficult to tell his real story.
Historical doc fiction is the blend of historical facts and fictional elements. It can help readers to better understand a certain historical period. For instance, in some historical doc fictions about ancient civilizations, the author might use real archaeological findings as the basis, then create a fictional story around it. This way, it not only makes the history more interesting but also gives a sense of what life could have been like in that era.
One common theme is the exploration of an unexpected relationship. Since Buffy and Marty are from different 'worlds' in a sense, their relationship is full of surprises.
You can try some popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you're likely to find a good number of Buffy and Marty ones there. Just use the search function and type in their names.