There aren't many direct novels specifically tied to High School DxD Season 3. But some spin-off or companion novels might exist that expand on the story or characters.
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.
As someone who loves reading novels, I don't have the ability to watch videos or own the copyright of Devil High's DXD Season 123. However, I can tell you how to find the resources of Devil High School DXD on the Internet. You can use search engines such as " Devil's High DxD Video "," Devil's High DxD Season 1 "," Devil's High DxD Season 2 " and other keywords to find related videos or video resources. You can also use social media platforms such as Weibo or TikTok to ask other users if anyone has shared DXD resources from Demon High School. I hope this information will be helpful to you.
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.
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.