Which Honkai Impact Fanfic Sites Offer Crossover Stories With Other Games?

If you're hunting specifically for Honkai crossovers, I'd actually caution against expecting a single dedicated site. The ecosystem is more of a network. Archive of Our Own hosts the majority of the curated, completed work. Its strength is in the meticulous tagging—you can find crossovers not just by fandom, but by specific characters or even tropes like 'Post-Canon' or 'Alternate Universe - Fusion.'

However, for in-progress, experimental, or discussion-driven crossover fics, the forum model of SpaceBattles is unmatched. Authors there often workshop ideas with readers, leading to stories that deeply integrate game mechanics or lore from both series. I followed a 'Honkai Impact / SCP Foundation' saga there that was brilliantly creepy, treating Herrschers as anomalous entities. It's a more niche and verbose corner of the fandom, but rewarding if you enjoy that collaborative, theory-crafting style alongside the story itself. Wattpad and Quotev have younger-skewing communities, so you'll find more 'Honkai / Genshin' or 'Honkai / Danganronpa' crossovers there, often with a stronger emphasis on romantic subplots or OC inclusion.

Honkai's got a pretty vibrant crossover scene, but it's not centralized on one 'site' per se. AO3 is the big one, obviously. The tagging system is a lifesaver for this. You can literally filter for 'Honkai Impact 3rd' and 'Crossover' and then add a fandom like 'Fate/Grand Order' or 'Star Rail' (though Star Rail feels like cheating). I've seen some genuinely creative takes, like a 'Honkai / Nier:Automata' fusion that explores the parallels between the Honkai and the Machine Lifeforms.

Wattpad has a chunk too, but quality varies wildly. You have to wade through a lot of self-insert stuff to find the gems. I remember one 'Honkai / Hollow Knight' fic on there that was shockingly good, treating the Herrscher powers like a form of Infection. It's hit or miss, but the algorithm can sometimes surface weird mashups you'd never think to search for. Forums like SpaceBattles are worth a look if you want lengthy, plot-heavy crossovers that read like a proper novel, often with forum readers debating the power scaling in the comments. It's a different experience.

AO3's definitely the main spot. The tags make it easy. Just search 'Honkai Impact 3rd' and filter for 'Crossover.' You'll get tons. FanFiction.net has some, but it's harder to sort through. Sometimes people post on Tumblr or Twitter threads, but those are really hard to track down later. I mostly stick to AO3 because I can also filter out stuff I don't want to see, which is crucial for crossovers that might involve characters or pairings I'm not into.

The straightforward answer is AO3. Its tag system is built for this. You search the Honkai Impact 3rd fandom, then add the 'Crossover' relationship tag. From there, you can see all crossovers or add a second fandom tag to narrow it down. I've found crossovers with everything from 'Fire Emblem: Three Houses' to 'Cyberpunk 2077' there. FanFiction.net has a smaller but decent collection, often with longer-running epics. For more obscure or experimental mashups, sometimes authors post snippets on their personal Carrd sites or Tumblr blogs, but those are harder to discover systematically. Honestly, starting with AO3 and letting related works lead you down the rabbit hole is the most effective method.

the dedicated crossover hubs are surprisingly scattered compared to something like a sprawling 'Marvel' fandom. Your most reliable bet is Archive of Our Own—just use the 'Honkai Impact 3rd' fandom tag combined with 'Crossover.' The filtering is unparalleled. You'll find everything from Genshin Impact merges (which, let's be real, are practically a subgenre of their own given the devs) to wilder stuff like 'Devil May Cry' or 'Persona 5' crossovers.

That said, a lot of the best crossposts end up on FanFiction.net as well. The search function is famously clunky, but if you drill down into the 'Honkai Impact 3rd' category and then sort by favorites or reviews, the popular crossovers float to the top. I stumbled on a fantastic 'Honkai Impact 3rd / Xenoblade Chronicles 2' story there that I never would have found otherwise.

Don't sleep on SpaceBattles or Sufficient Velocity forums, either. They're text-heavy and more discussion-focused, but the 'Creative Writing' sections often host ambitious, serialized crossover projects that treat the mechanics of both worlds seriously, like a 'Honkai / Arknights' tactical op. The vibe is less ship-centric and more about world-building clashes.

Finally, check specific Discord servers for big Honkai creators or fan artists. They sometimes have dedicated fanfic channels where WIPs or recommendations get dropped, including niche crossovers that haven't hit the major archives yet. It's a bit of a dig, but the community recs are gold.