So, crossover fics can be a real mixed bag, but there’s a pretty solid subset for Naruto winding up in the DxD world. The classic approach usually drops a post-war, maybe even post-'The Last' Naruto into Kuoh Academy, often as a teacher or a new student. One I’ve been following lately is 'Shinobi of the Crimson Slayer'—it’s not complete, but the author does a decent job balancing Naruto's jaded, war-weary persona with the over-the-top chaos of the DxD setting. He doesn't just steamroll everyone, which I appreciate; they actually make his chakra a distinct power system that the supernatural factions are trying to figure out.
What makes or breaks these for me is how they handle the power scaling. A lot of fics just have Naruto one-shotting everyone, and that gets dull fast. The better ones, like 'A New Kind of Jinchuriki,' use his sealing expertise and tactical mind as his main assets, forcing him to work with the ORC and navigate devil politics. The romance is always tricky—some force a harem instantly, others build a slow burn with a single character, like Rias or Akeno. Honestly, the ones that remember Naruto's own loneliness and how that might resonate with, say, a devil trying to escape an arranged marriage tend to have more emotional weight.