Which Fandoms Have Popular Ao3 Polyamory Fanfiction Collections?

I mostly read for animated series, and 'She-Ra and the Princess of Power' is a major hub. It didn't start with Catra/Adora, but after the series ended, a ton of fics popped up exploring what a healing, healthy relationship for both of them might look like—and that often involves introducing a third, like Entrapta or Glimmer, to help balance their dynamic. The fandom is really thoughtful about trauma recovery, which makes the poly stories feel more substantive than just smut.

'Arcane' is another huge one. The Piltover & Zaun setting is built on factions and uneasy alliances, so poly fics there often explore political marriages or alliances-through-relationship between characters from opposing sides. You get a lot of Caitlyn/Vi/Jinx or Jayce/Viktor/Mel Medarda stories that are as much about governance and class conflict as they are about romance. The art for these fics is also next-level; the aesthetic really inspires people.

Man, polyamory fics are everywhere now if you know where to look, but some fandoms just have a way bigger buffet. The 'Critical Role' and 'Dimension 20' D&D actual-play spaces are absolutely overflowing with them. The nature of those long campaigns means characters have years of complicated, shifting relationship dynamics, so writers have a ton of material to work with. It feels less like forcing a ship and more like exploring all the potential connections the story already hinted at.

You'll also find massive collections for big ensemble casts like 'The Untamed'/'Mo Dao Zu Shi' and 'Good Omens'. With 'The Untamed', there's this whole built-in cultivation world with complex bonds beyond the central romance, so fics exploring Lan Wangji/Wei Wuxian/Jiang Cheng or adding in Nie Huaisang are super common and often really well-developed. 'Good Omens' had a surge of triads adding the Archangel Gabriel or Beelzebub to the Aziraphale/Crowley dynamic after season two.

Surprisingly, some of the most nuanced poly works I've read come from the 'Bridgerton' fandom. It's not just about adding another person to a main pairing; a lot of fics dig into the societal pressures of the ton and imagine how secret arrangements or marriages of convenience between multiple people could work. The historical setting adds a layer of tension you don't get in a modern AU.

Honestly, I think any fandom with a strong 'found family' trope or a large core friend group tends to generate more poly content. 'Harry Potter' has its classic Harry/Draco/Hermione or the Marauders-era stuff, but it's the 'Six of Crows' fandom where the whole crew feels like a potential polycule waiting to happen. The lines between loyalty, love, and partnership are so blurred in that series, it's a natural fit.

My corner of the internet is all about the superhero polycules. The Marvel Cinematic Universe fandom has massive collections, especially around Steve Rogers/Tony Stark/Bucky Barnes—the 'Stucky' vs. 'Ironstrange' war gets sidestepped by just including everyone. Those fics range from epic, universe-spanning sagas to domestic fluff where they all argue over how to renovate the Avengers compound kitchen. A lot of them tackle the super-soldier/longevity issue in interesting ways.

Then there's 'The Owl House'. Lumity is canon and perfect, but the show's ethos of found family and rejecting rigid destinies made polyamory a natural extension for the fandom. Luz/Amity/Hunter is a big one, often focusing on shared trauma and building a new life together in the human realm. The fandom's overall positivity and focus on communication bleed into the writing, making most of it incredibly warm and affirming to read, even when dealing with heavy topics.

Older TV fandoms still going strong for this. 'Supernatural' has endless Destiel + someone else fics, often adding Benny, Meg, or even Rowena. 'Teen Wolf' is a poly juggernaut—Sterek is huge, but adding Derek's sister Cora or a human like Stiles creates these complex pack dynamics fics that are more about collective belonging than just romance. The werewolf soulmate tropes get repurposed in really creative ways for poly bonds.

From what I've seen, media with established love triangles or 'which one will they choose?' setups often spawn poly fixes. 'Twilight' had a whole wave of Bella/Edward/Jacob fics back in the day, and 'The Hunger Games' still generates Peeta/Katniss/Gale stories. It's like fans rejecting the forced binary choice the narrative presents. Current ones? 'Heartstopper' has a surprising number of Nick/Charlie/Isaac or Nick/Charlie/Tao fics, usually framed as gentle, communicative explorations of queer identity rather than drama. The tone of the source material carries over.