So, the idea of Naruto as a god popping up in the 'Highschool DxD' sandbox always struck me as a weird but fun thought experiment. It's less about power levels, honestly, and more about which version of 'god' you're even talking about. Are we pulling from the later 'Boruto' era where he's basically a ninja deity, or is this some fanon ascension after the Fourth War? Because the tone clash is the real story.
'DxD' has its own divine hierarchy—Angels, Fallen Angels, Devils, Old Gods—all wrapped in ecchi comedy and serious myth arcs. Dropping Naruto into that means deciding if his chakra-based abilities even register as divine power in that universe, or if he'd be classified as some new type of Youkai or Unknown species. The politics would be fascinating; would he align with the Grigori out of curiosity, or would Sirzechs try to recruit him for the Underworld? The character interactions write themselves, like a meeting between his relentless optimism and Azazel's mad-scientist curiosity.
Personally, I think the most compelling fics ignore the 'one-shot everyone' trope and focus on the cultural displacement. Imagine him trying to explain the concept of 'ninja' and 'tailed beasts' to a bewildered Rias Gremory, or his sheer bafflement at the Rating Game system. His experience with entities like the Sage of Six Paths could give him a unique perspective on the Biblical factions' long-standing conflicts, maybe even positioning him as a mediator. The potential isn't in the fight scenes, but in the quiet moments where his hard-earned wisdom from a world of endless conflict bumps up against the 'DxD' universe's more structured, yet still deeply flawed, celestial bureaucracy.
I've seen a few attempts that just make him another overpowered harem lead, which misses the point entirely. His story was always about connection and understanding, not adding another girl to his peerage.