One popular 'Naruto Gabriel DxD' fanfic is 'Naruto: The Red Flash in the Underworld'. It combines the unique abilities of Naruto characters with the setting of DxD in an interesting way. The story often has Naruto using his ninja skills and chakra in the battles within the DxD universe, which makes for some exciting action scenes.
Character development is key. When a fanfic shows how Naruto and Gabriel grow and change in the combined universe. Maybe Naruto becomes more understanding of the different species in DxD, and Gabriel learns about the ninja way. It also helps if other characters from both series are well - developed, not just the main two. There could be interesting interactions between Sasuke and some of the devils in DxD, for instance.
You can try looking on popular fanfic websites such as Archive of Our Own (AO3). It has a large collection of fanfictions, and there's a good chance you'll find a Gabriel x Vinette fanfic there. Just use the search bar and type in the relevant tags like 'Gabriel Dropout', 'Gabriel x Vinette' and see what pops up.
A good fanfic in this pairing often has well - developed characterizations. It should capture the essence of Gabriel and Vinette's personalities as seen in the original series. For instance, Gabriel's lazy - yet - secretly - caring nature and Vinette's sweet and somewhat naive personality.
The Gabriel Knight novels typically involve mystery and the supernatural. The main character, Gabriel Knight, is often on a quest to solve strange mysteries, usually involving elements like voodoo or ancient curses.
One of his best novels is 'One Hundred Years of Solitude'. It's a masterpiece that weaves a complex web of family history, time, and magic realism. The Buendía family's story over generations is both captivating and thought - provoking.