What Are Popular Undertale Undyne X Papyrus Fanfiction Storylines?

I've spent way too much time diving into 'Undertale' fanfics, and King Papyrus is a goldmine for creativity. One standout is 'Royalty Reimagined,' where Papyrus reluctantly inherits the throne after Sans vanishes. The story nails his mix of goofy charm and unexpected wisdom, showing how he struggles with responsibility while keeping his spaghetti-loving spirit. His dynamic with other characters—especially a fiercely protective Undyne as his knight—adds layers of humor and heart. Another gem is 'Crown of Puzzles,' which reimagines Papyrus as a strategic genius who turns the Underground into a giant trap-filled labyrinth. His growth from a naïve skeleton to a cunning ruler is brilliantly paced, with nods to his iconic quirks like his love for capes and dramatic speeches. The fic balances action with emotional depth, especially in his strained-but-loving relationship with Sans. It’s a fresh take that respects his canon personality while expanding it.

I honestly don't think Undyne and Papyrus fics get enough credit for how they can push both characters into genuinely new emotional spaces. A lot of the popular stuff just has them goofing off or being aggressively friendly, which is fun but not really growth. I look for fics where their dynamic forces change—maybe Papyrus's relentless optimism makes Undyne confront her own insecurities about being a good mentor, or Undyne's raw intensity pushes Papyrus to set firmer boundaries or define his own strength beyond just 'being nice'. One I'd recommend is 'Burning Bright, Staying Determined' on AO3. It's a post-pacifist run story where Papyrus decides he wants to understand Undyne's determination on a deeper level, which leads them into these intense, almost philosophical sparring sessions. Undyne has to articulate feelings she usually just screams through, and Papyrus starts to see his own patience as a form of power equal to her physical strength. Their growth isn't about fixing each other, but about expanding their own self-concepts because of the other's perspective. Another angle is fics that explore Papyrus's hidden depths—like, he's not just naive, he's deliberately choosing optimism. I read one where Undyne, after a bad failure, snaps at him about it, and his response isn't to get sad but to calmly explain why his hope is a conscious weapon. That moment forces Undyne to grow past seeing his attitude as childish. Those are the gems: where the ship becomes a lens for examining their core traits under pressure.

Exploring fanfiction for Undyne and Papyrus feels like wandering into a less-charted corner of the Underground where their dynamic, so full of potential energy in-game, finally gets to combust. The pairing thrives on a specific kind of alchemy—Undyne's fierce, unbridled passion crashing against Papyrus's earnest, rule-bound optimism. It’ s not the most obvious match, which is exactly why the stories that work feel so rewarding; they have to bridge a genuine gap in understanding and lifestyle. I gravitate toward narratives that don’t soften Undyne’s edges or make Papyrus naïve, but instead let them forge a connection through mutual, baffled respect. A standout for me is 'Conduction,' a long-form piece that frames their relationship through the lens of Papyrus attempting to learn combat that 'makes sense' and Undyne slowly realizing teaching is about more than throwing spears. The author nails Papyrus’s unique logic, where a cooking lesson or a puzzle can become a profound metaphor for trust, while Undyne’s chapters simmer with her frustration at her own inability to articulate feelings that aren’t rage or excitement. Another memorable one is a shorter, quieter story titled 'The Quiet Before the Quiet,' set in a post-pacifist run Snowdin. It explores the odd peace they find in early mornings at Papyrus’s house, where Undyne’s restlessness meets Papyrus’s methodical routine of 'pre-morning skeletal maintenance.' The beauty is in the small moments: Papyrus interpreting her loud silences, Undyne discovering a strange calm in the meticulous way he dusts his battle body. It sidesteps grand romance for something more fragile and observational, treating their bond as a series of careful, mutual adjustments. What both these stories share is a commitment to the characters' core identities, using the friction between them not as a problem to be solved, but as the very texture of their connection. You finish them feeling like you’ve witnessed something built, brick by bizarre brick, which for me always beats a story where compatibility is a foregone conclusion.

Finding adventure fics for that specific pairing can be a real deep dive. You don't see Undyne and Papyrus shipped together too often outside of crack or fluff pieces, so an adventure-focused story is a niche within a niche. I'd hit up Archive of Our Own first and use the right tags. You'll want to filter by the pairing 'Undyne/Papyrus' or 'Papyrus/Undyne', then maybe add additional tags like 'Adventure', 'Quest', or 'Action/Adventure'. Don't be discouraged if the results are slim. Sometimes the best method is to find an author who writes great adventure fics for the fandom and check their bookmarks. I found a solid multi-chapter one last year called 'Royal Guard Training Days' that had them on a monster-hunting expedition in Waterfall. It's less about romance and more about their dynamic, which honestly is the fun part anyway. The author has since orphaned it, but it's still up on AO3.

The relationship between Undyne and Papyrus, or Papyrisk as some fans call it, often builds on a dynamic the game itself only hints at. In 'Undertale', their friendship is already full of boisterous energy, from Papyrus’s enthusiastic admiration of the Captain of the Royal Guard to Undyne’s proud yet affectionate mentorship. Fanfiction writers latch onto that existing spark and ask: what if Papyrus’s relentless, innocent optimism began to chip away at Undyne’s tough exterior in a different way? The development usually isn't a sudden confession; it’s a slow, often hilarious process of Undyne realizing her feelings are shifting from pure mentorship to something more confusing. She might find herself disarmed not by his fighting prowess—which is comically lacking—but by his unfiltered sincerity and unexpected moments of insight. Papyrus, meanwhile, might remain blissfully unaware for ages, interpreting his own increased heartbeats during training as a need for better cardio, which creates this wonderful blend of comedic misunderstanding and genuine warmth. Many stories explore the tension between Undyne’s canon romance with Alphys and this alternate pairing. Some fics exist in an AU where Alphys isn’t in the picture, allowing a clear path. Others tackle the complexity head-on, with Undyne navigating confusing feelings for two very different people, often leading to angst or a gentle, polyamorous resolution. The development frequently hinges on shared activities beyond training, like Papyrus’s cooking attempts becoming a bizarre bonding ritual, or Undyne discovering he’s a surprisingly thoughtful listener during quiet moments in Snowdin. His childlike wonder contrasts with her intensity, and writers show how that balance allows her to be vulnerable in a way she seldom is. The romance matures as Undyne learns to express affection in softer ways—maybe helping him organize his action figure collection instead of just smashing things—and Papyrus responds with his trademark pure-hearted devotion, seeing the best in her even when she feels uncertain. What makes the pairing compelling across so many fics is its foundation in mutual, unwavering belief. Papyrus never doubts Undyne’s strength or goodness, and Undyne never mocks Papyrus’s dreams, even when she teases him. That bedrock of respect makes a romantic shift feel earned. The development often culminates in a scene where Undyne, flustered and avoiding her usual yelling, finally admits her feelings, and Papyrus responds with overwhelming joy and a declaration that this is the best possible outcome, better than even joining the Royal Guard. It’s less about dramatic conflict and more about two wildly different personalities discovering a unique harmony, with his innocence tempering her ferocity and her strength giving his optimism a confident anchor. You finish a good Papyrisk fic feeling like their world is a brighter, warmer place.