Undertale books
39 stories
Trust  {Sans x Reader} by ForgottenMatter
ForgottenMatter
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You woke up and tried to gaze around the darkened room, your vision was blurry. It was just a bad dream, you thought. Your eyes adjusted and you realized it was far from it... {Completed} Thanks so much for 300+ votes & 10k+ reads, holy heck.
My One and Bonely (Sans x Reader) by Flutterbat276
Flutterbat276
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My first story. It's a sans x reader fic, so don't judge too harshly. Also I have some bad pacing issues, but I hope yall will ignore them. Anyways on with the summary! You see monsters everywhere. All of theme unique and friendly. You ask "how could anyone hate them?" When you save one of them, you're life takes a drastic turn.....for the better. Highest rank: #16 in Undertale (June 2020)
Saving Them (an Undertale fanfiction) by fucking_username
fucking_username
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The barrier is broken, monsters and humans are living in peace, everyone is happy except for one person. Frisk has been getting waking nightmares about not saving Asriel. They want to save him to erase all guilt and to be with their friend. But Asriel isn't the only one that needs to be saved. Something, someone lurks inside Frisk's soul. Someone deadly and has a hunger for power, and can kill anyone they want. A/N Frisk and Chara are both gender ambiguous in this story. Also there will be a little bit of Frisk x Asriel in this story, but this is not a Frisk x Asriel fanfiction. Credit to @karinacat59 for the cover. Undertale belongs to Toby Fox and none of the characters are mine.
Reset {UNDERTALE} by emotistic-optimistic
emotistic-optimistic
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    Parts 19
*FEATURED STORY* As Judge for King Asgore Dreemurr, Sans has seen a lot of strange stuff. But when he wakes up with the feeling that something is completely wrong, he decides it's time to investigate with the only monster who could know what was happening: Royal Scientist W.D. Gaster.
Charisk The Difference between us by Charaisk
Charaisk
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This story will take place in the underground and eventually be leading out into the open world when monsters have been freed. There will be some twists in the plot if I can get to that point in this fanfiction. Also frisk and Chara are both girl in case anyone was wondering. I own none of the art due to a fatal flaw. I cant draw :). There will be fluff an possible lemon if I can bring my self to it.
Hybrids are Bonely by Seer_Luna
Seer_Luna
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There's one person who found grief after Asgore took their mother's human soul. This person's father blamed it on them. He was a monster. He abandoned her. He said he would kill her if she came around him. So this girl used a device of the great royal scientist, W.D Gaster, and traveled to another timeline. This one followed one rule. Kill or be killed.
Wrongtale by Orkstoni
Orkstoni
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THIS STORE IS DISCONTINUED DON'T READ THIS IT'S EMBARRASSING It was done. You've freed the monsters from the underground without killing a single on of your friends. The monsters have been brought into society with open arms. Everything was going great. And that's when the unexpected happens. You wake up in a pile of wilting, dry yellow flowers.
Undertale: Possession by Frozenuniverse
Frozenuniverse
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Frisk is happy that she's with all her friends she made in the underground. But something's up. Flowey had ran away when Frisk had defeated him. They think he wants revenge, but they're not for sure. Then things start going on with Sans. What's going on? Can they find out what's going on? Just read to find out! I write ideas that come to my head! :) Btw, my later writing/chapters are so much better than what it was at the beginning chapters. XD And also, I didn't know so much about Undertale at the beginning of this book as I do now. XD