It might be an abbreviation for a name, like 'David X. Doe' or something similar. Or it could be a unique name within a specific group or community that is into fanfiction. Maybe it's a code name for a person who reviews fanfiction. Without more context, it's really hard to say for sure.
I'm not entirely sure specifically what 'dxd adult fanfic' is. 'DxD' might refer to a particular series (such as 'High School DxD'), and 'fanfic' stands for fan fiction. However, the 'adult' part implies it could be fan - created stories with mature or inappropriate content which is not suitable to discuss in detail.
The number of DxD novels can be a bit tricky to pin down. Different regions might have different releases and editions. Your best bet is to do a comprehensive search on popular book databases or consult with avid fans of the series.
The Highschool DxD manga has indeed finished. It wrapped up after completing all the planned story arcs and providing a satisfying conclusion for the readers.
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Well, the Bleach captains' abilities are quite powerful. For example, Hitsugaya's ice-based zanpakuto could be used in interesting ways in the DxD world. It could freeze demons in their tracks. Their spiritual pressure might also have a significant impact on the supernaturals in DxD. They could potentially intimidate lower - level devils or fallen angels just with their presence.