A Relaxed Battle Novel About Sans, Preferably a Long One 关于Sans的悠闲战斗小说，字多一些

1. 1 传 Undertale: Am I Playing Sans? 传说之下：我扮演sans了？ The Sourest Fish with Pickled Cabbage最酸的酸菜鱼Anime Fanfiction775k WordsCompleted (Transmigration + OOC + chat group) Wait, how did I become Sans from Undertale? The System floating in the air answers all his questions. And from the very beginning of his transmigration, he’s thrown into a hell-level challenge. After completing it, he must travel to different parallel worlds under Gaster and the System’s supervision. (Worlds completed so far: Original, Horror, Dust, Swap, KTT, and Insanity) 807Reads7.3Score103Shelves

   Reader note

   The quantity is a bit small, mainly because the type you mentioned is relatively rare to begin with.

2. 2 星 Honkai: Star Rail: How Is This Skeleton So Strong? 星铁：这个骨头架子怎么这么强 A Beautiful Little Firefly一只美丽的萤火虫呀Anime Fanfiction91k WordsCompleted “Seriously, Sans, can you take this seriously?” “Ha ha ha, March, you should know skeletons can fall apart.” (After being utterly destroyed by Sanb 114,514 times, an overworked office worker went out to clear their head, only to get hit by a runaway truck and end up in the world of Honkai: Star Rail. They awakened a System that lets them become a different judge every day, then set off on a wonderful adventure aboard the Astral Express.) A friendly reminder: You may want to go through the story 729Reads6.6Score104Shelves
3. 3 化 As UKB: Seriously, Why Is the Multi-World Prosecutor Still Chasing Me? 化身UKB：不是，多审还在追我 Xiao Yuan-chan小源酱Anime Fanfiction292k WordsOngoing "No System, not invincible, few tearjerkers (because the author isn't very good at writing them either)" AU title: [Undertale: Karma Fire Samsara] (Suitable for casual play, not too exhausting.) Li Yuan stayed up all night grinding CTT, then died suddenly along with his computer. When he woke up, he had become Sans. But the player here didn't seem like a good sort. After twelve consecutive failures, the timeline went a little haywire on the thirteenth attempt. A secret beneath the cliff. A stran 419Reads6.7Score—Shelves
4. 4 绝 Zenless Zone Zero: Where Did This Custard Tart Come From? 绝区零：哪来的酥皮蛋挞？ Why Break the Ultra Key为什么折断奥特钥匙Anime Fanfiction107k WordsOngoing I wake up and find myself in Zenless Zone Zero? But I'm a crispy tart. Sans: “Bro, where the heck did you bring me? Is this still the Underground?” Ethereals: “Don't come any closer!” 399Reads—Score—Shelves
5. 5 传EN Undertale: I Forge the Perfect Ending! 传说之下：我！完美结局铸造者！ Chuan Shang Mang Ke川上芒可Anime Fanfiction208k WordsOngoing (Toxic-content warning: There is a female lead, neither lead is particularly strong, there are other transmigrators, some details involving time travel are inconsistent, and the pacing is slow at first. If you can accept all of that, then let’s begin!) AU name: LD! Undertale Lin De accidentally transmigrates to the world of UT! To reach an even more perfect ending, he travels through time and space, stepping outside the grasp of the unseen hand behind the scenes, all to understand the truth of t 281Reads8.7Score—Shelves
6. 6 传 Undertale: A Journey of My Own 传说之下：属于我的一场旅途 Looking into the Distance遥望至Anime Fanfiction942k WordsOngoing What is set in stone cannot be changed. All we can do is accept it. After dying suddenly in an accident in his previous life, Heripons transmigrates into the world of the game Undertale! But as the price, he loses some of his memories. Guided deliberately by Frisk, the game's original protagonist, he manages to reach the Pacifist ending and recover some of the memories he lost. He thought he could only go on living in someone else's body and appearance, but an encounter planned long in ad 1.1kReads8.7Score138Shelves
7. 7 成 Becoming Error 成为error Zhiye Kalas Hali Si治也卡拉斯哈里斯Anime Fanfiction310k WordsOngoing An Undertale AU fanfic, mostly based on my own headcanons, not canon. About a certain skeleton who decides to become a destroyer. Due to circumstances beyond my control, an official pairing was added later. It doesn't appear in the main story, only in the extras. But after signing the contract, I couldn't change the tags, ugh. Everything the protagonist does comes from his own heart. Whether good or evil, it's his own choice. No pairings in the main story. [The protagonist doesn't consider hims 2kReads8.7Score114Shelves
8. 8 传 Undertale: Her Journey, His Echoes 传说之下：她的旅途，他的回响 Xu Xun, Who Loves to Argue爱吵闹的绪寻Anime Fanfiction130k WordsOngoing (This is the author's first time writing, so the prose may not be very good. Feel free to discuss the setting, but please don't bring your personal headcanons into other works.) This book is also known as Undertale: This Human Is Adventuring Again Today I'm not good at writing synopses. Please head straight to the story. After the multiverse arc begins, the romance will be different from what came before, including the blurb. When he woke up, Ze Peng found himself on a mountain. As he walked for 175Reads6.6Score—Shelves
9. 9 自 My Custom Sans Travels Through the Myriad Worlds 自设sans的诸天旅行 GenoAnime Fanfiction685k WordsCompleted [The Myriad Worlds + National Fate + Sans] About my original character, who has multiple personalities and wanders around the Myriad Worlds. (Note: Updates every Tuesday, Friday, Saturday, and Sunday.) Most of Sans’s characterization is based on canon, fanon, and my own ideas. (Any similarities are purely coincidental.) 215Reads7.2Score—Shelves

   Reader note

   Some of them may not have the word count you're looking for, but they're all really great.

10. 10 k Killer Doesn't Want to Move killer不想动 Gray Baiye灰百叶Anime Fanfiction501k WordsCompleted [Undertale AU fanfiction + No romance + Dual protagonists + Dual personalities + No System] A crossover with my previous book, Transmigrated as Horror, set in the same world. Also known as I Became Killer's Other Personality. A soul from another world merges with a soul in pain. Sharing their memories allows them to trust each other. Along this long and painful road, will they find redemption, or fall into the abyss... “I long for peace, but fate always pushes me toward a different path.” “P 1.3kReads8.9Score128Shelves
11. 11 禁 Exploring the Forbidden Zone: My Teammate Is Dupi 禁地探秘之我的队友是杜皮 The Five Elements of Heaven's Way天道五行Urban175k WordsCompleted (There aren't many scenes set in the forbidden lands; most of the story takes place in other worlds. Unfortunately, I can't change the title, so it'll have to stay this way.) [Potential heroine]+ [The Role-Playing System barely features]+ [Chat Group] Here, you'll see Xiao Ming steal someone else's account right in front of Oma Zi-O, Zero and Tartarus shake hands and make peace, becoming good friends, Dupi turn into a planet-destroying big shot, and Yugi Muto sweep through worlds with Exodia. Th 133Reads7.0Score—Shelves
12. 12 国 National Fate: Sans Has Something to Say 国运：sans表示有话要说 Just Keep Smiling for Now现在只要微笑就好Modern Romance50k WordsCompleted “I” was a typical 21st-century college student, until a truck suddenly came barreling down the road and sent “me” to another world. In short, “I” became a soul and was stuffed by some scientist whose surname started with G into the soul of a little skeleton whose surname started with S. But “I” couldn’t move or speak. Then, after a few well-known events, the monsters came to the surface. At last, “I” could speak! Though only to Sans. So every day, “I” rambled on inside Sans’s head. Sans: ... Thi 156Reads—Score—Shelves
13. 13 U Undergoodluck LuckyFlowerAnime Fanfiction148k WordsCompleted [Undertale fanfiction] [Amateur writing (._.)] [No System] [The main cast are all native AU characters] [Any resemblance is purely coincidental] A human child named Clover falls into the Underground. Lucky Clover survives the fall and begins a strange and wonderful adventure through this bizarre place... After exploring the Underground comes a journey through the multiverse. Our AU has no ending!! Main cast: my original character Luck Sans, my OC Clover, and Dust! 65Reads—Score—Shelves
14. 14 梦 After the Dream: Ream 梦想之后—ream ReamAnime Fanfiction388k WordsOngoing [Signed] After Dream *Dream transmigrated... I was just playing with a seed, and somehow transmigrated. True peace and all that. Faith, Nightmare, a System cheat. A Minecraft streamer’s comeback journey! “Why don’t you turn off your cheats if you’re so good?” “I use cheats because I can.” Without cheats, this loser Dreamer is only a bottom-tier fighter. Why is the plot progressing so slowly! This cheat makes it feel like an invincible-protagonist story! Stop padding things out and get the pl 67Reads6.5Score114Shelves
15. 15 转 Reborn as Murder 转生murder Lazy Yu懒惰的宇Anime Fanfiction112k WordsCompleted After countless massacres, Murder unexpectedly gained countless memories about UT. He also happened to join a chat group connecting myriad worlds, and began his journey across them. 189Reads6.5Score—Shelves
16. 16 原 Genshin Impact: ULBSans Powers from the Start 原神：开局ulbsans能力 Threefold Memories of Days Gone By三重往日时光Anime Fanfiction339k WordsCompleted (There are angst scenes, there are angst scenes, there are angst scenes. Important things must be said three times, though the angst is mild.) Liu Yang was an ordinary high school student on Blue Star. After an accident, he transmigrated to Teyvat and gained a System. From the start, he received the abilities of ULB Sans and became one of the many Archons. Realizing that the Archon War was about to break out, he joined Morax and others in founding the Guili Assembly. But his arrival caused rippl 378Reads7.3Score103Shelves
17. 17 U UT: Our Everyday Lives UT：我们的日常 Li Xiaomi黎晓蜜Anime Fanfiction132k WordsOngoing [Undertale fanfiction + personification + Bad Sans crew(?)] An Undertale fanfic about the Bad Guys, with the characters personified. It's mostly everyday life and fairly low-stakes stories, set in my own world. I drew the cover myself, and there are lots of original headcanons, so if that's not your thing, please leave. I originally wrote this story just for myself, so go easy on me. 1Reads—Score—Shelves
18. 18 U UT: I Joined the Bad Time Trio to Fight a Green-Tea Bitch?! UT：我上邪骨团打绿茶？！ Gui Chen归灬尘Anime Fanfiction127k WordsOngoing [Undertale] [UT] [Undertale] [Bad Sans Crew] The female lead has no romance. Side pairings include ErrorInk, MustardKetchup, NightmareKiller, and MurderHorror. The female lead comes from a derivative AU of the Blossoms Fade AU. She isn’t kind or saintly, and the backstory has been changed somewhat. The story is mainly about the female lead being selected by the System and joining the Bad Sans Crew. She half-heartedly helps deal with a suspicious little green tea who seems to have the crew’s skel 171Reads6.8Score—Shelves
19. 19 国 National Fate: I Transmigrated as Sans, with Zhongli as My Teammate 国运：穿越sans，队友钟离 Magician of the Rainbow Bridge七彩虹桥的魔术人Anime Fanfiction329k WordsOngoing [Undertale / UT Fan Work] [The national fortunes are not dominated by one country] I know the title's a bit of a mixed bag... But the story itself is even more complicated ( ) [The writing in the first few chapters isn't very polished, so they may not be the best read, but please stick with it for a few more chapters!] A veteran UT player with a complicated background transmigrates, only to find himself caught up in a game of national fortunes? Complete the game across ten worlds, and you can re 2.3kReads9.4Score179Shelves
20. 20 国 National Fate: Sans Can Dominate Even While Frail 国运：sans即使病弱也能横推 TascrilAnime Fanfiction192k WordsOngoing Sans takes part in the National Destiny game. No transmigration plot, but there will be AUs. I’ll do my best to capture Sans’s personality and avoid making him OOC. Sans is the strongest fighter in another world. A fragile mage with infinite magic. No System, no CP, survival game. There will be viewing-room segments where secret identities are exposed. I started writing this because I wanted to write a power fantasy. I changed the cover. I drew it myself. I didn’t have time to change it before b 616Reads8.1Score100Shelves
21. 21 穿 Transmigrated Into Horror 穿越成horror Gray Baiye灰百叶Two Male Leads418k WordsCompleted [System + sans + Undertale derivative] The story of an ordinary transmigrator. Pairing: murder × horror, no fixed roles 806Reads9.2Score104Shelves
22. 22 国 National Fate: Fell's Bizarre Adventure 国运：Fell的奇妙冒险 1912一九一二Mystery160k WordsOngoing After enjoying ten years in a peaceful timeline, things still went wrong for Fell. First, something claiming to be a National Destiny System suddenly appeared. Then Fell was chosen as a contestant. Fell: hdxjirfhudv 251Reads7.5Score—Shelves
23. 23 国 National Fate: Even Today, Sans Wants to Blow Up the System 国运：今天的Sans也想炸系统 Mo Liersha莫莉尔莎Anime Fanfiction74k WordsOngoing [No transmigration, no watching-the-story, no CP, with original Sans in the spotlight] There'll be secrets exposed, there'll be showboating, there'll be a little AU, and there'll be the author's long-delayed chuunibyou phase. A ridiculously squishy, unbelievably powerful mage with maxed-out evasion in every sense. I just want to see Brother Sans show off, have his secrets exposed, and then blast me, his unscrupulous creator, out of here. If you're happy, I'm happy, and everyone's happy. I recomm 210Reads6.6Score—Shelves
24. 24 传 UnderTale FNF Sans in the National Destiny Game 传说之下fnf衫在国运 A Dumpling Shaped Like a Mantou像馒头的团子Anime Fanfiction35k WordsOngoing After meeting BF in Sans, he learned a new skill: rap. Once that was done, I couldn't think of anything else to write, hahaha. I'm planning to start this book from scratch, so give it a follow! Also known as: IndCross Sans in National Destiny 59Reads—Score—Shelves
25. 25 传 Undertale: Dust's Search for His Bro 传说之下Dust劳弟的寻哥记 UT AddictUT重度依赖Anime Fanfiction279k WordsOngoing [Undertale + OC + multiverse] Pure fanfiction. Where it differs from the original, please treat it as my own interpretation. Apologies for any out-of-character moments. Mostly slice-of-life and battles, with pairings and crossovers. The characters may not be very well developed in this first book. 309Reads—Score—Shelves
26. 26 传EN Undertale: A Bad Sans's Journey Through the Multiverse 传说之下：邪骨旅行多元宇宙 oirAnime Fanfiction236k WordsCompleted [Anthropomorphism + multiverse + time-and-space redemption + very little OOC] After escaping the octopus's control, Killer Sans decides to travel across the multiverse, making friends in different worlds and saving other timelines with fates like his own. Along the way, he meets the experienced Murder, the mysterious ulb, and even the eerie, terrifying Sanstrosity. - Killer Sans: That's right, I'm talking to you! Want to be my friend and help me save the universe from disaster? Then type 1! Murd 253Reads8.4Score—Shelves
27. 27 暮 Twilightale 暮光传说twilightale Dream of the Future未来之梦Anime Fanfiction265k WordsCompleted Keywords: Undertale, Undertale, AU, Sans An unconventional Chinese-made AU This story may have no beginning, and may never have an ending. What kind of spectacular tale will unfold on the stage of this multiverse? The blurb doesn't do it justice, so I recommend reading the story itself. This is an unconventional Chinese-made AU. I've left the fandom, and I'm only writing this book to fill in the gaps. I don't want to keep drawing, so I've switched to writing a novel instead. I'm an average writ 205Reads8.6Score—Shelves
28. 28 原 Genshin Impact: I Become Lazy Bones Sans from the Start 原神：开局变成懒骨头sans I'm Really Shi Le我真是时乐啊Anime Fanfiction358k WordsCompleted [Undertale + Genshin Impact + Nearly Invincible + System + Infinite Flow + Tearjerker + Protagonist’s Emotional Growth] “Dude, how is this lousy skeleton so strong?” After being blown to bits by Yuan Shan for the 1,145th time, Shi Le, an 80-year-old Undertale fan, thought back on his pathetic life and finally snapped (sob). When he woke up again, he was already in Mondstadt. “Dude, did I actually become Sans?” 509Reads7.6Score100Shelves

    Reader note

    I personally think it looks good ⊙ω⊙

29. 29 国 National Fate: Sans Tried to Slack Off, but Failed 国运之sans摆烂未遂 Zhuo Yi Lin濯沂霖Anime Fanfiction185k WordsOngoing Ultraman. Classic National Destiny setup. No transmigration, with AU characters. Parts not mentioned in the original may include my own headcanon, and characters from other works will make guest appearances. I'll write whenever inspiration strikes. Basically, I want to write something fun, and I'll try not to break your heart… probably. There'll definitely be some revelations about the past, too. All in all, I just want to serve up some real feast-for-the-soul action and have everyone kick ass. 167Reads7.1Score—Shelves
30. 30 来 A Monster from Undertale: Sans 来自传说之下的怪物：sans A Lump of Lazy Bones sans一坨懒骨头sansAnime Fanfiction423k WordsOngoing After arriving in the Undertale timeline and becoming Sans, he gains the power of Causality Code and puts a stop to the player’s genocide run. He goes to the surface with Frisk and the others, only to discover that human scientists have also begun researching “soulology.” The source of it all is the anomaly caused by that player. But Sans has no intention of taking on a whole skeleton-load of trouble. Still, one thing after another comes his way, and Sans catches sight of versions of himself fro 661Reads—Score100Shelves

    Reader note

    Mine has both battles and daily life, perfectly fitting the description.

31. 31 传 Undertale: The Story of an ULB 传说之下：一只ulb的故事 Leader of the Way of Great Peace太平道道主Anime Fanfiction150k WordsCompleted Give him one molecule of oxygen and he'll dance until the world ends. He is the fearsome ulb. General of the Army Douglas MacArthur, speaking from far away on the surface, once said, “If God told me to defeat ulb, then God himself would have to join the battle with a real sword.” Asgore, king of the Underground, also said, “From the moment I appointed ulb as judge, I knew I would never see another slaughterer again.” Frisk, humanity's ambassador for peace, said, “After ulb's trial, I never commi 208Reads7.1Score—Shelves

    Reader note

    I also wrote one myself, but it was only a few hundred words long.

32. 32 传 From the Start in Undertale, I Create a Sans Chat Group 传说之下开局创建sans聊天群 Lazybones Sans懒骨头杉斯Anime Fanfiction177k WordsOngoing I reincarnated as... Sans. The genocide route?! Liu Feng looks at the human before him as a Gaster Blaster slowly materializes behind him. Today is such a beautiful day... Papyrus, would you like something... How about we team up against the humans? Do I have any other choice? Dust Sans takes Liu Feng’s hand. (I’m new to this, so please be kind!) 52Reads8.1Score102Shelves
33. 33 M Murder, the One Who Carries Out the World's Will Murder，践行世界意志之人 oirAnime Fanfiction148k WordsOngoing [Anthropomorphism + System + Native, Not a Transmigrator; Undertale derivative, CP: Murder x Killer] … In the ceaseless cycle of reincarnation, who can remain untouched by endless repetition? Murder, born of Dusttale, was unexpectedly bound to a “System” at the end of a timeline. From then on, he was forced to travel through different times and spaces, helping the native Sans solve problems. After completing eighty-one missions, the plan to erase humanity would finally reach its conclusion! To d 17Reads6.7Score—Shelves
34. 34 传 Undertale: The Genocide Route 传说之下【屠杀线】 Kitty Hescu猫猫赫斯克Anime Fanfiction96k WordsCompleted Our battle takes place in the corridor; who wins and who loses is determined by the truth. The killer's heart has already fallen into endless darkness. This is Undertale's [Genocide Route]. 17Reads—Score—Shelves
35. 35 c Chara: A Glitch in the Undertale Timeline chara传说之下错乱时间线 Reincarnator Chara Xingyu转生者chara星雨Anime Fanfiction251k WordsOngoing By chance, in an unexpected shower of starlight at a comic convention, she was chosen by a terrifying bolt of multicolored lightning. And so began a wondrous adventure in Undertale. Reincarnated as Chara in a chaotic timeline full of uncertainty, she was bound to a "salvation" System and created a UT chat group. Across the multiverse, she journeys and embarks on adventures!!! 6Reads—Score—Shelves
36. 36 我 I Opened a Bone Daycare in the Real World, Shocking the Internet 我在现实开了骨头幼儿园震惊全网 Song of Dreams梦想之歌Modern Romance78k WordsCompleted [This story has CP pairings: Tomato and Wasabi, crnm, ie, and ckc. No male lead. If you don't like it, please don't flame me.][The beginning is an explanatory section for newcomers. If I start introducing test subjects, that means I'm telling you about my original Laboratory series. It's my own creation, so feel free to make derivative works, but don't go too far or ruin the characters.][The first part is an introduction and explanation; the national destiny plot comes later.][One day, the prota 44Reads—Score—Shelves
37. 37 穿 Transmigrating After K-ing My Own Team 穿越自家K后的战斗生活 Taiga and Killing泰迦与killingAnime Fanfiction132k WordsOngoing [Transmigration + no System + no heroine + mindless] An abandoned work… 30Reads—Score—Shelves
38. 38 U UT: A Multiverse Calamity UT：多元宇宙之灾 Pu Xiang Wang Bao Lazy葡香旺堡LazyAnime Fanfiction170k WordsCompleted My new work is here! You can find it on Tomato Novel and read my stories. I hope you’ll enjoy them. Your support motivates me to write, and I’ll do my best to tell every story well! 2Reads—Score—Shelves
39. 39 虐 Bullying My Brother Feels Good for a While, Then Comes the Heartbreak 虐弟一时爽，碎梦火葬场 Huang Yu Ding黄昱丁Two Male Leads219k WordsOngoing [Undertale + Dreamtale + Bad Sanses + cunning Shattered] Extremely OOC, and it gets extremely melodramatic later on. Fanfiction. Fanfiction (emphasis on that again). A fanfic of Undertale and Dreamtale: Shattered Dream. It has two volumes. The first tells the familiar old stories, and the second follows up with my own original continuation. The protagonist seems innocent but is secretly dark, and his younger brother is yandere. 1Reads—Score—Shelves
40. 40 F Feather’s Half-Alive Feather的半死不活 Li Xiaomi黎晓蜜Anime Fanfiction135k WordsCompleted [Undertale spinoff + my own OCs + Evilbone group + writing whatever] First off, this book is purely for fun, and I can't promise regular updates. It's lighthearted, has no romance, though there may be platonic relationships. The story moves along pretty quickly. I'm not good at writing introductions, so please read the book. * This book has a mountain of headcanons. * Nightmare in this book will have fewer elements from the official canon (the canon is trash, so I'm not using it. I just like evi 132Reads—Score—Shelves

    Reader note

    I wrote this myself; it's not about fighting, but it's very relaxing.

41. 41 听 Listen Up, You Fools 听着，蠢货们 Li Xiaomi黎晓蜜Anime Fanfiction38k WordsCompleted [Undertale Fanfiction + Bad Guys + Nightmare + A Little Mind Reading] How should I put this? It's a pretty bad story, very mundane and meandering. I wanted to read it myself, so I wrote it, and since I wrote it, I published it. If you don't like it, please go easy on me when you criticize it. (This is blatant mistreatment of Nightmare, so hardcore fans, run! And I'm not going to address the protagonist's name.) 122Reads—Score—Shelves
42. 42 原 Genshin Impact: Reborn in Fontaine as Fufu’s Big Sister 原神：重生枫丹之我是芙芙姐姐 The World's Tuning Lawbearer世界的调率律者Anime Fanfiction202k WordsOngoing “A strategist enters the game himself, and with one move can outplay the emperor.” The moment Furina Chen entered the gacha pool, she became a work of art. [HoYoverse, give us our Furina back!] [So everything was part of her plan?] [Rest in peace, Focalors. We offer you our highest respect… Furina Chen de Fontaine.] [Here’s fifty-seven or eighty million Mora for the lawyer’s fees… HoYoverse, give us our wife back!] [Furina Chen/Furou’s move was brutal.] [There’s another twist?] “Fufu… Sister… I’ 192Reads—Score—Shelves

    Reader note

    How about this one? I wrote it myself.

43. 43 原 Genshin Impact: Sans's Bizarre Adventure 原神，sans的奇妙冒险 An Ordinary, Anxious Person平凡又焦虑的人Anime Fanfiction532k WordsCompleted [No female lead + not invincible] After countless cycles of peace and slaughter… Sans: Okay, this is really “skull.” I should've known you'd be the variable that showed up in the timeline. G: Countless resets have made this timeline abnormal. You don't belong here anymore. Go out and broaden your horizons. Sans: Okay. (shrugs) I hope wherever I end up has ketchup and hot dogs. (The author is just writing this in their spare time, so there isn't a draft or anything. I write whenever inspirati 364Reads8.4Score105Shelves

    Reader note

    Genshin Impact, Sans's fantasy adventure is absolutely perfect.

44. 44 御 Beast Taming: Together with My Bone Brothers 御兽：和骨兄弟一起 User30021124用户30021124Anime Fanfiction388k WordsCompleted [UT + Sans + Papyrus + All UT Characters + AU + Legally Cat-Eared Shota + Beast Taming + Everyday Life + All Original Undertale Characters] Mostly sweet, with a little angst. A complicated mix. No female lead doesn’t mean no CP, right? The CP in this book is Lin He and Chara (“split self”). This book is mostly everyday life, though things get crazy sometimes. Lin He was an ordinary high school student. While playing an Undertale fan game, his keyboard started malfunctioning, his blood pres 92Reads—Score—Shelves
45. 45 原 Genshin Impact: Dust-Stained Fontaine 原神：尘染枫丹 DeafgsansAnime Fanfiction267k WordsCompleted Dusttale Murder!Sans was battling Chara in the Core when he accidentally fell into it. He should have been erased by the timeline, but instead he unexpectedly ended up in Fontaine... Wait, why has he gotten smaller? And now he’s caught up in some inexplicable romantic entanglement. He’s told everyone he won’t fall in love with anyone... right? As time goes on, Murder discovers that a lot of things aren’t right. Or rather, there’s something wrong with him! Rules of this story: 1. “Contempt” is th 120Reads—Score—Shelves

    Reader note

    The first book has a sequel.

46. 46 星 Honkai: Star Rail: The Judge from UT 星穹铁道：源自UT的审判者 Meng Xingcheng梦星澄Anime Fanfiction135k WordsCompleted [Honkai: Star Rail]+ [UT]+ [Invincible]+ [Single Female Lead]+ [Single Protagonist] Female lead: - Abilities: Boss-level Sans soul powers + the souls of the seven strongest pioneers + administrator/hacker - Role: Judge (not necessarily a fighter) Synopsis: Original AU: Star Domain Tale An independent world created by seven pioneers with the most powerful souls. Years later, the brilliant scientist Gaster’s research into soul power brings her into being, armed with powerful Determination and an e 160Reads—Score—Shelves
47. 47 明 Arknights: The Bizarre Adventures of the Sans 明日方舟：sans们的奇妙冒险 666 I Can't Change My Name Back666名字改不回去了Anime Fanfiction40k WordsOngoing There’s ut, Guizhou Fish King (Guizhong Yuwang), a sudden change, UB, UKB, cotv … 41Reads—Score—Shelves

    Reader note

    I happen to have a good, underrated novel here.

48. 48 关 That Time I Went from an AU to the World of Ponies 关于我从au穿到小马世界那档事 Tripe Soup Puff Pastry肚丝汤酥皮Anime Fanfiction272k WordsOngoing Mu Qingyi, a high school sophomore in the 21st century, was abducted by a beam of white light while watching UT videos at home. He arrived in a world with only 27 hours left and became Sans. Later, for reasons unknown, he ended up in the world of My Little Pony. He doesn't know much about this world; he's only seen one or two episodes. But he discovers that he seems to be the strongest one here. And so, a vacation in another world begins. 168Reads—Score—Shelves
49. 49 传 Undertale: She’s Not the Protagonist 传说之下：她不是主角 Cat Cat Dog Dog Cat猫猫狗狗猫Anime Fanfiction373k WordsOngoing [Transmigration] [No Romance] [Ensemble Cast] [Everyone Is Strong] [A Little Golden Finger System, Redemption, and Wild Ideas] [Antagonist] [Slow-Paced and Lighthearted at First, Then a Transitional Middle] [Happy Ending] A lot of UT players transmigrated into this UT multiverse, a place that seemed peaceful on the surface but was actually rife with undercurrents... Narrator: *Among the people working to protect the peace of the universe, there is a hidden killer with the employee number 103. At 83Reads—Score—Shelves

    Reader note

    The later stages are more intense and the battles become more intense.

Other lists with Undertale: Am I Playing Sans?