Crossover MHA fics? Honestly, most of the ones I've stumbled on are over on Archive of Our Own. Their tagging system is a lifesaver when you're looking for something specific. I filter by 'Crossover' in the fandom field, then add 'My Hero Academia' as the secondary fandom.
That said, the quality can be a real mixed bag. You'll get these epic, novel-length merges where the world-building is insane—like a 'My Hero Academia'/'Fullmetal Alchemist' fusion where alchemy is a quirk type. But you also have to wade through a lot of poorly executed 'character-gets-isekai'd' plots. I tend to sort by kudos after filtering to find the standouts.
Don't sleep on some older forums, either. SpaceBattles and Sufficient Velocity have dedicated threads for MHA crossovers, especially ones that lean into power analysis or alternate universe scenarios. The discussion threads there can be as fun as the stories themselves.
I'm gonna go against the grain a bit and say Wattpad is surprisingly decent for this niche, if you know how to search. Their algorithm is messy, but if you type in something like 'BNHA x [Other Series]' you can unearth some real passion projects. The writing might not always be polished, but I've found a few crossover AUs with 'Jujutsu Kaisen' there that had a raw, energetic charm you don't always see on the more curated sites. Just be prepared to filter through a lot of self-insert stuff.
Tumblr is my weird little secret for discovery. You don't read the fics there, but the fanart and meta posts often lead you to them. An artist will draw Deku with a Keyblade, and in the notes someone will link to a 'Kingdom Hearts' crossover fic on AO3. It's a more serendipitous route, but I've found some of my favorite obscure crossovers that way, like a shockingly good 'My Hero Academia'/'The Magnus Archives' fusion that reimagined One For All as an entity. The social aspect helps gauge what the fandom is actually excited about at the moment.
FF.net still has a massive backlog. Use the crossover category, pick 'My Hero Academia' and your other fandom. Sorting by favorites is a must. The interface feels dated, but stories like 'Heroes of the New World' (a 'One Piece' crossover) started there and have a huge following.
2026-07-13 00:46:04
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Found it on AO3 after sorting by kudos for the 'Crossover' tag and filtering out the shorter works. The tagging system is a lifesaver for this niche.