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.
You can try websites like Fanfiction.net. It has a large collection of fan - made stories for various series, including Highschool DxD. Just search for 'Highschool DxD Vali' and you'll get a list of relevant fanfictions.
One popular fanfiction might be those that explore Vali's backstory more in - depth. For example, stories could detail his training and how he became so powerful.
Well, Naruto has a wide range of powerful abilities like his shadow clones, rasengan, and chakra control. In the Highschool DxD universe which is filled with devils, angels, and fallen angels, his powers could be quite unique. His shadow clones could be used for various strategic purposes, like scouting or overwhelming opponents in battles. His rasengan, being a powerful concentrated attack, could be a real threat to the supernatural beings there. And his chakra control might give him an edge in adapting to different situations compared to the more traditional magic - based powers in DxD.
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.
Well, in regular Naruto fanfictions, the story mainly revolves around the shinobi world, its clans, and the power struggles within it. For DxD fanfictions, it's more about the supernatural hierarchy and the battles for supremacy among different factions. However, Naruto DxD Shop fanfictions stand out. They create a unique space where items from both Naruto and DxD are available for purchase or trade. This changes the dynamics of the story as characters from both universes can interact in a new way, centered around the shop. It gives a fresh take on how the two worlds can interact and influence each other, which is not a common feature in the other types of fanfictions.
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.