What Are The Best Fanfic Arrow Crossovers With Other Superheroes?

Finding those takes a bit of patience, but they're out there. My first thought is Archive of Our Own, obviously. The tagging system there is a lifesaver when you're hunting something this specific. Filter by the 'Arrow (TV)' fandom, then crossovers, and you can often add additional fandom tags like 'Marvel Cinematic Universe' or 'The Flash (TV 2014)'. You'll get a mixed bag—some are just Oliver Queen meeting the Avengers, others fully integrate the 'Arrow' characters into a bigger superhero universe. Don't sleep on fanfiction.net either, even if the search is clunkier. The sheer volume means there are older crossover epics that never got ported over to AO3. Try searching for 'Green Arrow' paired with 'Iron Man' or 'Batman'—sometimes you get comic-book Oliver Queen instead of the TV version, but the plots can be just as fun. Tumblr blogs dedicated to specific pairings or crossovers sometimes rec them, but it's more of a scavenger hunt.

It depends on what you mean by 'best,' honestly. Are you looking for classic post-season-two Oliver and Felicity stuff, or the darker 'what if' scenarios that twist the show's premise? Most people will point you to Archive of Our Own first, and I get why—the tagging system is phenomenal. You can filter for completed works over 100k words, which weeds out a lot of the abandoned WIPs that plague other sites. But I have a soft spot for some older, dedicated LiveJournal communities. The quality there feels different; writers took their time with world-building, and the feedback was more substantive. A lot of those stories got migrated to AO3 eventually, tagged with things like 'Arrow Season 2 AU' or 'Slade Wilson Redemption.' Those are my personal favorites—they explore the moral grey areas the show sometimes glossed over. Don't sleep on FanFiction.net either, even though its search is a nightmare. The sheer volume means there are hidden masterpieces buried under piles of... less masterful work. I found a fantastic multi-chapter where Oliver is trapped in the League of Assassins and Nyssa al Ghul is the central POV character, and it's only got like twelve reviews. You have to dig, but the gems are there. My current bookmark is a crossover with 'The Blacklist' on AO3, where Oliver Queen and Raymond Reddington have to negotiate a truce between their... respective circles of influence. It shouldn't work, but the author nails the voices. That's the kind of thing I'm always hunting for—the storyline that makes you see the characters in a whole new light.

Arrow? Like Green Arrow? Honestly, I'd skip the show-based fics entirely if you're just starting. Most of it is heavy Felicity or Olicity stuff from years ago, and the quality is super inconsistent. I'd point anyone to the comics-inspired fics on AO3. Look for works tagged with 'Oliver Queen/Black Canary (DCU)'—that's the classic Dinah Lance pairing from the comics, not the TV show's version. There's a fantastic, old-school author named 'sapphicschina' who writes these tight, character-driven one-shots that feel like lost issues. Another great one is 'kingmakers' which is a sprawling, modern-day mob AU that somehow gets Oliver's voice perfectly—that charming, haunted bravado. You can also filter for 'Oliver Queen & Roy Harper' if you want some classic mentor-protege found family stuff, less romance-focused. Just avoid the 'Arrowverse' crossover tag at first; it gets overwhelmingly big.

The crossover between 'The Flash', 'Arrow', and 'Supergirl' that really stands out to me is the 'Invasion!' arc from the 2016-2017 season. It brought together Barry Allen, Oliver Queen, and Kara Danvers in a way that felt organic and thrilling. The Dominators as villains were a great choice because they forced the heroes to confront not just an external threat but also their own insecurities and differences. The episode where Supergirl first meets the team is gold—her optimism clashing with Oliver's brooding nature, while Barry plays the mediator, creates such a fun dynamic. And let's not forget the iconic scene where Kara and Barry race each other, leaving Oliver hilariously unimpressed. The follow-up episodes delve deeper into the team's chemistry, especially when they face off against mind-controlled versions of themselves. It's a fantastic exploration of their fears and flaws, something the Arrowverse does really well. The crossover also sets the stage for future team-ups, making it a pivotal moment in the series. What I love most is how it balances action with character development, giving each hero their moment to shine while weaving their stories together seamlessly. It's the kind of crossover that makes you wish these shows would collide more often.

Okay, so everyone loves a 'Skyrim' mashup, right? But superhero stuff... I've tried writing one and honestly the big trap is just making the Dragonborn wear spandex and call it a day. The fusion has to be in the mechanics. I made my character a former mage who got hit by a Daedric artifact during a planar tear—ended up with a weird hybrid of Alteration magic and, like, tactile telekinesis. Instead of just shooting fireballs, he could shape flames into constructs, making shields or bindings. The Thalmor hunted him because he was an 'anomaly,' which felt very 'Skyrim'—outsider hunted by authorities. What didn't work was just adding Superman powers. It broke the low-fantasy survival feel. So my rule now: powers should have a cost or a limitation rooted in Tamrielic lore. Maybe using a Shout drains your 'super' energy, or your kryptonite is Black Soul Gems. That way the struggle stays.

The best Justice League crossover fanfics often blend DC's iconic heroes with unexpected universes, creating something fresh yet familiar. One standout is 'Worlds Collide,' where the League teams up with 'My Hero Academia' characters—imagine All Might and Superman debating hero ideals while fighting a merged villain threat. The writer nails the voices, especially Batman's dry humor clashing with Deku's earnestness. Another gem is 'Infinite Crisis: Marvel Rebirth,' a sprawling epic where the Avengers and Justice League face a corrupted Infinity Gauntlet. The action scenes are cinematic, but it’s the quieter moments, like Wonder Woman and Captain America comparing wartime trauma, that stick with you. For something darker, 'Justice League: Shadows of the Empire' drops the team into the 'Star Wars' galaxy post-RotJ. The dynamic between Green Lantern and Luke Skywalker, both grappling with legacy and power, is brilliantly explored. The author doesn’t shy from hard choices—Hal Jordan’s struggle with the no-kill rule against Sith Lords feels visceral. If you prefer lighter tones, 'League of Extraordinary Ponies' (yes, really) is a hilarious yet heartfelt 'My Little Pony' crossover where Flash’s speedster jokes land perfectly amid Equestria’s chaos.

If you're hunting for that specific Olicity arrowverse content, AO3 is basically your only realistic option these days. The tagging system there is so precise you can filter for 'Oliver Queen/Felicity Smoak,' then add things like 'Post-Season 3' or 'Canon Divergence' to get exactly the right flavor. I tend to sort by kudos or bookmarks to find the community-vetted highlights. Finding the 'best' is subjective, obviously. Some of the most kudo'd works are epic slow-burns that rebuild the whole show, while others are these perfect little missing moment one-shots that slot right into an episode. My personal favorites are the ones that explore Felicity's tech skills as more than a plot device, giving her real agency. The '5 times' and '10 times' trope fics are also a solid entry point if you want quick reads that nail their dynamic. Honestly, the quality on AO3 can be shockingly high—better prose than some published novels I've read. But you have to wade through a lot to find it. I'd avoid the 'Complete Works' filter initially and look at works-in-progress with consistent update schedules; sometimes the hottest ongoing fics haven't accumulated the stats yet but are absolutely brilliant. FanFiction.net still has an archive, but it's a ghost town for new content and the search is terrible. Tumblr has snippets and headcanons, but for full, polished narratives, AO3 is the hub. I'd start with authors like 'somewheressword' or 'tdgal1'—their back catalogs are deep and they really understand both characters.

Anyone else remember that 'DOOM: Hell on Earth-616' series from a few years back? It got really popular in some circles because the author didn't just drop the Slayer into the Marvel universe to punch things. They actually grappled with the cosmology clash. How does a divine curse that literally cannot be killed interact with something like a Phoenix Force host or a reality-warper? The story framed the Slayer's rage not just as anger, but as an absolute, reality-anchoring constant—a force of 'no' against chaos. There was a whole arc where Doctor Strange tried to contain him, and the mystical shields just... shattered on contact, not from power, but from a fundamental rejection of their rules. It's less about superhero team-ups and more about the Slayer as an unstoppable natural law crashing into a world built on compromise. The fights with Hulk were brutal, sure, but the eerie moments were better, like when he stood completely still as telepaths tried to read his mind and just got a feedback loop of silent, focused fury. That writer understood the assignment: it’s not a power-level contest, it’s a tonal apocalypse.

Finding Arrow fanfiction feels oddly tricky these days, since the show ended. I mainly stick to Archive of Our Own—the tagging system is unbeatable. You can filter by characters like Oliver/Felicity or Diggle & Oliver bromance fics, and sort by kudos or hits to see what's trending. There's still a steady stream of post-canon fix-its and 'what if Oliver lived' AUs that pull decent engagement. Sometimes I'll check FanFiction.net out of nostalgia, but the activity has definitely slowed. The 'Arrow' category there still has a deep back catalog of stories from the show's peak, though. Tumblr tags can surface some hidden shorter pieces or drabbles, especially for rare pairs, but it's more of a scatter-shot approach.