Gaster Stories

Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways. *Edited Summary (29/09/2025)

An AU where the Glitchtale verse and One Punch Man verse are combined. Get ready for an insanely action packed series!

A player is offered the chance for something new. With something long thought discarded.

Everyone is born with a mark that connects them with their soulmate. Some are super clear, giving you the name of your soulmate, while others are just pictures and you have to rely a bit more on your gut to find your special someone. In this world their are both monsters and humans. Time period wise it's more of medieval times, with lords and castles and all that good stuff. This is completely because I have no self-control and may be addicted to this game...

what would happen if sans somehow managed to break the game and a new human had to navigate this broken world?

You think war is over...? Because war never ends. Story takes place in the underground when an unexpected twist of Flowey brought chaos across the land of Undertale. Secrets of W.D.Gaster along with other characters also mystery that's hidden deep inside the True Lab... will the last glimpse of hope save everyone...? Or will it be destroyed like everything else...

Monsters have lost. Surrendered at the hands of the enemy. They've been locked away underground in a cavern system under Mount Ebbot. No sign of getting out. How will they live Within the Barrier? Credit to @_zbruh_is_awseome_ on instagram for the cover and for all the help on the book! :D This is still in writing phase so I won't be editing Grammer and spelling very much. WARNING: THIS IS A FANFICTION AND THIS STORY GOES HOW I WANT IT. IF YOU DON'T LIKE IT YOU CAN GO ELSEWHERE. THERE IS A DEFINED LINE BETWEEN CONSTRUCTIVE CRITICISM AND HATE COMMENTS. HATE COMMENTS WILL NOT BE TOLERATED. Disclaimer: All characters and some of the story line/details belong to Toby Fox or their rightful owners. There may be writings influence by NinnyMouse here on Wattpad and some characters and ideas where given to me with permission to use by _zbruh_is_awseome_ on instagram. Notes: Swearing, gore, or depressing themes may be shown in the book. No sin will be written for said book.

For centuries, monsters have been buried beneath the earth, trapped by a magical seal that only seven human souls can break. But the Royal Scientist is tired of waiting for the surface world to fall. To shatter a barrier forged by the strongest human mages in history, he has decided to stop following the rules of the living, and start rewriting the laws of the dead. From a sliver of ancient bone and a vat of concentrated magic, Subject H4Y.D3N is born. He is a ghost of a god-like race, a draconic monster brought back to a world that has forgotten his kind. But life engineered in a cold laboratory comes with a price. As Gaster carves the path for two more "vessels" to follow, he realizes that power is not easily tamed. Toby Fox is the creator of undertale, I only created this AU and Hayden is my creation

The monsters were free, most humans accepted them! But then they were some that didn't, when an experiment goes wrong its human's worst nightmare...Zombie Apocalypse

Sans doesn't typically get in trouble on his own account. But after Asriel's alter personality, Flowey, gets him in trouble one last time, Sans is forced to volunteer at the local orphanage. There he meets one particular kid that will change his entire world.

The story of Chara, the first fallen human. After being adopted into the royal family of the monster kingdom, Chara must discover their role in the fight to free monsterkind, all while battling inner demons to discover their true nature and identity. **NEW CHAPTER EVERY WEDNESDAY AT 1PM MST**

You never want to test a wolf's loyalty to the pack. Especially if they are willing to decorate the walls with you. They always say ignorance is bliss, and it is when it comes to a certain family. Just don't overstep your boundaries. No one has ever seen or heard the boss of this mafia, but everyone knows them. Be careful which family you mess with, or the last thing you'll be seeing are red eyes.

Long ago, two races ruled over the Earth. Humans and monsters. At least, that's the story we all know. There was another race. Technically, they were monsters. Skeleton monsters to be exact. Humans shunned them because they were monsters. Monsters shunned them because humans had skeletons. In retaliation, the skeletons split into two different races. The Surface Skeletons and the Abyss Skeletons. The Surface Skeletons reaches out to both monsters and humans. However, when the war started, they were some of the first monsters attacked and many were killed when they fought with the other monsters. Only a handful were sealed underground but without the Sun to strengthen their bones, the skeletons suffered until they received anonymous help. Very few survived to this point and slowly, they died out. The Royal Scientist at the time and his wife tried to have children. Each time left them severely weakened. Each child dusted until the wife gave up her life to bring a great skeleton into the world. That child is the last of his kind. The Abyss Skeletons shunned all other monsters and humans, considered them all demons. Their society was alike human society long ago. Divided. They believe they are strong and emotions only weaken. The class system was rigid and they possessed a kill or be killed attitude to all other monsters and humans. They thrived underground and ended up building their society in the Underground's own Abyss. It is a shame that only their leader can reclaim their heir from the corruption caused by those demons. Warning: Rated Mature for possible smut and probable gore. I'm sorry I don't know what I'm doing but this ain't for little kids. Also, cover doesn't belong to me. Credit to creator. Found it randomly when I searched up Undertale.

Naruto is neglected by his parents for his sister, whom has half of the kyuubi sealed within her and is treated as the hero of Konoha. One day a mob had been attacking Naruto when two ambassadors that were not from The Elemental Nations saved him. They ask him if he is alright. Does he tell them he's fine and walks away? Or does he tell them the truth and have a forever changed future?

You could only stand there and bare the pain of loss. You knew losing loved ones hurt, but when you lost them twice, it really stings. So when all that's left to love is your cat, and the only one you need to escape is your abusive adoptive father, you decide to make a plan to run away. In hopes to start a new life. In hopes he won't follow you. In hopes you could be free. --- Key: (Y/N)- Your Name (L/N)- Last Name (F/C)- Favorite color (S/F/C)- Second Favorite Color (F/F)- Favorite Food (F/D) or (F/B) Favorite drink or Favorite Beverage

Titled Seven Humans on AO3 Frisk finds a human child in the Ruins, and then another in Snowdin, two in Waterfall, and two more in Hotland. Maybe this time, they stand a chance of freeing everyone.

Sans has finally beat the kid,she finally Stopped resetting but there's a problem sans is still alone,until he was pulled into a portal to another au what will he do, will he get back to his au, can he get his friends back, read this story to find out

"𝐘𝐨𝐮 𝐰𝐞𝐫𝐞 𝐚 𝐬𝐚𝐢𝐧𝐭 𝐮𝐧𝐭𝐢𝐥 𝐈 𝐦𝐚𝐝𝐞 𝐲𝐨𝐮 𝐦𝐲 𝐬𝐚𝐜𝐫𝐢𝐟𝐢𝐜𝐞." 𝐒𝐚𝐩𝐡𝐢𝐫𝐢𝐧𝐚 was a creature of peace-a calm soul with a heart that had never known a bruise. She lived in a world of sunshine until the shadows of the 𝐕𝐨𝐢𝐝 noticed her. He is no longer the man she once knew. 𝐉𝐞𝐨𝐧 𝐉𝐮𝐧𝐠𝐤𝐨𝐨𝐤 is a fractured god, a glitch in reality who is slowly being consumed by his own darkness. He is cold, he is cracked, and he is starving. 𝐇𝐞 𝐝𝐢𝐝𝐧'𝐭 𝐭𝐫𝐚𝐩 𝐡𝐞𝐫 𝐛𝐞𝐜𝐚𝐮𝐬𝐞 𝐡𝐞 𝐥𝐨𝐯𝐞𝐝 𝐡𝐞𝐫. 𝐇𝐞 𝐭𝐫𝐚𝐩𝐩𝐞𝐝 𝐡𝐞𝐫 𝐛𝐞𝐜𝐚𝐮𝐬𝐞 𝐡𝐞'𝐬 𝐝𝐲𝐢𝐧𝐠. The Void is eating him alive, and Saphirina's purity is the only thing that keeps him whole. He doesn't want her heart; he wants her 𝐞𝐬𝐬𝐞𝐧𝐜𝐞. He needs her on her knees, just to feel a spark of life in his frozen veins. ••• "𝐏𝐥𝐞𝐚𝐬𝐞... 𝐥𝐞𝐭 𝐦𝐞 𝐠𝐨," she sobbed, her white dress torn at the shoulder where his rough hands had claimed her. "𝐓𝐡𝐢𝐬 𝐢𝐬𝐧'𝐭 𝐲𝐨𝐮, 𝐉𝐮𝐧𝐠𝐤𝐨𝐨𝐤. 𝐓𝐡𝐢𝐬 𝐢𝐬 𝐚 𝐦𝐨𝐧𝐬𝐭𝐞𝐫." He didn't flinch. He never did. He just stepped out of the shadows, the violet cracks on his skin glowing with a predatory hum. "𝐘𝐨𝐮'𝐫𝐞 𝐫𝐢𝐠𝐡𝐭, 𝐥𝐢𝐭𝐭𝐥𝐞 𝐬𝐢𝐧. 𝐉𝐮𝐧𝐠𝐤𝐨𝐨𝐤 𝐢𝐬 𝐝𝐞𝐚𝐝," he whispered, his thumb bruising her bottom lip. "𝐁𝐮𝐭 𝐭𝐡𝐞 𝐦𝐨𝐧𝐬𝐭𝐞𝐫 𝐢𝐬 𝐡𝐮𝐧𝐠𝐫𝐲. 𝐀𝐧𝐝 𝐲𝐨𝐮 𝐥𝐨𝐨𝐤 𝐬𝐨 𝐝𝐞𝐥𝐢𝐜𝐢𝐨𝐮𝐬 𝐰𝐡𝐞𝐧 𝐲𝐨𝐮'𝐫𝐞 𝐭𝐞𝐫𝐫𝐢𝐟𝐢𝐞𝐝."

Sans has gotten sick, OH NO! So what happens when our funny pun loving skeleton gets sick? Hurt/comfort, Fluff, and lots of overprotective family moments with a side of Horror????? Kind of... ish. The story takes place in a SORT OF HC version of the UT Cast, but enough to allow readers of all kinds to enjoy a good story! Shipping will only be for cannon ships (if you allow Asgore x Toriel XD). Also DADSTER. LOTS OF DADSTER. WE LOVE DADSTER. You might find some rarely spoken characters make an appearance here too ;3 Please enjoy!

This fucking sucks PLS dont read it