Which Platforms Host The Best Flowey X Papyrus Crossover Fanfiction?

The pairing's niche, so it really depends on the fandom's migration over the years. Tumblr used to be the hub for most Undertale AUs, especially ask blogs and character muses, and you'd find a ton of crossover stuff there. But discovery is a pain now with their search. AO3 probably has the most organized archive, but you've got to sift through a lot—tagging for that specific crossover is inconsistent. Some authors use 'Flowey Asriel Dreemurr/Papyrus,' others just tag 'Undertale Alternate Universe' and let you figure it out. I remember finding a pretty dark, interesting series on FanFiction.Net that crossed over with 'Deltarune' concepts, where Flowey's timelines got entangled with Papyrus's puzzles in a weird meta-way. It's not updated anymore, but the older stuff is still up. For more visual or meme-centric takes, DeviantArt's literature section and some Discord servers still host text-based roleplays or short stories. The real trick is looking for the AU names, like 'Underpants' or 'Flowey's Laboratory,' rather than just the ship tag. That often leads you to dedicated blogs or archives that have fallen off the main platforms. Honestly, I just lurk in the forums on SpaceBattles sometimes; the writing quality there can be surprisingly high for such a weird crossover.

I spent more time than I'd care to admit trying to track down Undyne x Papyrus crossover content, and it's definitely a deep dive. You won't find a single dedicated hub for it, as it's an incredibly niche pairing that also jumps into other worlds. Your search becomes a two-step process: first finding a platform with robust crossover archives, then using their filtering systems to sift through the chaos. I found that Archive of Our Own (AO3) is your most reliable starting point because of its meticulous tagging system. You can combine tags like 'Crossover', 'Undyne/Papyrus', and the specific fandom you're interested in, like 'My Hero Academia' or 'Harry Potter'. This precision helps cut through the mountain of other Undertale content to find those rare fusion stories. The hunt also led me to FanFiction.Net, which has a massive volume of stories but a much less intuitive filter. You'll need to navigate to the Undertale section, then the crossover category, and manually comb through summaries for any hint of the pairing—it's more of an archaeological dig. Forums like SpaceBattles or Sufficient Velocity sometimes spawn these kinds of weird, creative mash-ups in their creative writing sections, often with a more action or world-building focus. Tumblr can be a surprising source, too, with writers sometimes posting short crossovers in threaded formats, though they're harder to archive and find later. Ultimately, finding this specific content feels less like browsing a library and more like joining a very specific treasure hunt where the community itself is scattered. You get a real sense of discovery when you finally stumble on a story that mashes up 'Undertale' with something like 'One Piece' and still finds a way to make Undyne and Papyrus the core dynamic. The joy is in the strangeness of the combination itself.