Strength is in the eye of the beholder. With the eyes of a man who fought all the 4 Shinobi Nations and almost won, I think I'm pretty strong.

In a bizarre turn of events, Izuku Midoriya's story of becoming the greatest hero was hijacked by two eccentric bony brothers. The two bros stop at nothing to make stupid jokes and pranks towards the boy while also dragging him into a series of absurd adventures that would make his journey that much more interesting. (I do not own the Cover. Substitute. Image made by Bella61068317)

Sans has gotten himself stuck in the void between worlds in a successful attempt to stop the resets of his timeline. He's not sure how long he's been chillin' alone there, but eventually a chance at escape stumbles his way in from the Veil of Death. His name?—Sirius Black. (no pairings)

What would happen if a certain, comedian skeleton was sent to another world after his tragic end? Well, let's just say. It'd be one *Hell* of a time.

(I do not own the cover) Error is thrown into the a new world, one without monsters, but vampires, and shapeshifters instead.

Legendary Celeste Mountain. Mythical Mount Ebott. The tales of these two ancient places are over. But what about those who came out victorious from their depths? Their stories were far from over. Thanks to a twist of fate, Madeline embarks on an unexpected adventure that shatters the boundaries of her world and intersects with the path of the young ambassador of monsterkind.

After fighting in Chara's genocide run for what seemed like a lifetime now, Sans devised a new plan to get rid of the wraith, in the hopes of giving his brother a happier life. In doing so, there were unintentional side effects and Sans found himself in an entirely new world. Undertale—more specifically, Sans, meet the Marvel Cinematic Universe.

Who knew dying could offer new possibilities to monsters? Or more like a second chance like humans have? Now, it sounds cool if only it wasn't for the fact that I have been transported to Hell... as a Human itself. And why is this other smiler so interested in me? Oh well, at least it's a beautiful day outside. (Cover by ArtBichon on Twitter)

Here we are we made it. The Underleague, the most difficult challenge for any pokemon champion out there. 8 Gyms, 4 Elite members, 1 ultimate pokemon master. Their latest opponent? A...ten year old kid, without a license and and little eevee...Um is-is this normal? Oh, so your Frisk and you literally fell down here? Well in order to get out you have to go through the league. Sorry

Monsters are free from the underground. There's only one problem, humans believe Frisk was harmed from their time there. This causes many issues for the monsters.

In a pacifist timeline, where Frisk is pretending to care about the monsters, Frisk goes home and exposes all the monsters' crimes. This has drastic consequences, especially for Sans.

The Barrier has finally been destroyed, though what it cost were the lives of all the monsters at the hands of one. What would happen if a bloodthirsty monster like that was released into the world still recovering from the calamity that was Muzan Kibutsuji?

All it takes is the random appearance of two characters from a completely different universe to offset the path fate has set for a certain virtual world. Sans and Undyne in an AU where the Central Cathedral raid fails. (Along with possibly the most uncanon ship in all of SAO and Eugeo x Alice)

After waking up from a nice ol' nap our good old pal sans the funny skeleman finds himself lost in a new world where death awaits right around every corner. Now he just wants to go back to sleep. (Sans isn t a human btw)

Sans the Skeleton ends up getting himself tossed into a world of Shinobi and Violence. In a world as crazy, and cruel as this one can be, he will need all the luck he can get if he wants to survive long enough to make it back home, and help out his friends that he has made along the way. The question is: what obstacles will they all have to face in order to accomplish their goals?

Sans managed to free the Underground from the loops, but at what cost? His friends are gone and he's fading more with each passing day. When he falls down, he doesn't know what to expect. Sans never imagined he'd awaken to his family standing over him and a pair of wings upon his back. This is the story of what comes next. For Sans, the afterlife may not be as pleasant as he hoped.

After waking up in a 10 year-old body, Error tries to figure out how it all led to that point. He didn't know where he was as his memories were fragmented. Being taken in by the Gaster of that AU and finding out that his codes are integrated in the AU, Error decides to rename himself as Chronos Erratum du Void. Chronos has to navigate his new life with his fractured Memory.

This isn't what was supposed to happen...He never wanted any of this. Now Sans has to drop his lazy-bones disguise and become something he never wanted to be, in order to save the ones he loves. Now that humans are falling quicker then ever before, those "Half-Bloods" will never know what hit them. ((Contains Character Death. Godlike!Sans)

Strange things came in play during their expeditions. Murals of every shape and size stretched along man-made and natural structures with paint that couldn't wash of and glowed at night. When they find the mysterious painter, they are pushed into a deeper story of war and tragedy. A story of a race whose existence was questioned, that was forgotten in this world. A race of monsters

WARNING! THIS FILE IS A LEVEL 3(SECRET) FILE, ARE YOU SURE YOU WISH TO PROCEED IN OPENING THIS FILE? IF YOU ARE NOT AUTHORIZED TO OPEN THIS FILE YOU WILL BE SEVERELY PUNISHED. PROCEED?

Every one of the AU know that Classic Sans exists, however they had never met him face to face until now. When they do finally meet their origin tale, everyone must undergo life lessons of acceptance and open mindedness as they try to come to terms with themselves that the alleged 'Bad Sanses' are no longer as bad as they used to be. All the while avoiding the evil W.D Gaster.

Something strange happened in magnolia , how will the fairytail guild handle the skele-bros

The biggest things in life often start with little ceremony. That's not the case for a certain skeleton in the underground, where chaos seems to breed chaos at every step. (formally titled 'Numbers')

Sans knew he couldn't not care anymore. The human had killed his friends right in front of his eyes too many times to count. So, he did something about it. And it worked. Except, he just didn't expect this to happen…

After hundreds of RESETS, Sans finally finds a way to stop Chara. However, these events lead to unforeseen consequences. Now finding themselves stuck in an entirely different universe, Sans and Frisk has to learn to survive in a new world where mythology becomes reality. However, they aren't the only ones who came along from the Undergound... Pacifist/Neutral!Frisk and Demigod!Sans

My head canon of what would happen if Dadster meets the Gaster of Handplates. There is going to be a brutally murder of a scientist, fluff feelings and a happy ending for S-1 and 2-P, so read it at your own risk.

Through different encounters, the Avengers get to know Sans.

Prequel to the game and "Souls Shining In The Dark." Long before Frisk, Asriel, or Chara, there was a skeleton named Gaster who wanted to help monsterkind. He invented the Core, found the love of his life, and started a family. Everything seemed perfect. Then everything started to fall apart. And it continued to get worse for his entire family for a long time.

Sans wakes up as a human. [[Suicide Mentions. Dark Mental Themes. Dark Themes in general]]

The demon that comes... But, what if they were just helping because they didn't know better? What if the killer was the one that summoned them with the chaos? And... A comedian decided to help with rebirth?

Dr. W.D. Gaster was a brilliant scientist, a loving father, a trusted adviser to the King. His work on magical electricity and determination was unparalleled. It's a shame, really, how his life was cut short during the peak of his experiments. Funny how things happen like that.

When Sans collapses with no warning, everyone is naturally worried. The cause, however, is something that seems absolutely impossible. Some unknown force has a hold of his Soul and is dragging him down into darkness. Dark. Darker. Yet darker. There has to be a way to save him. And whatever it might be, they'll find it.

Basically a short parody of the beginning of the movie Logan but with the undertale characters. Its a one shot so yeah. I obviously don't own either Undertale or the X-Men franchise...

Serie of Onshots about Father Figures in Undertale and it's AUs

The story of Sans, Papyrus, and Gaster and how we know the Skelebros today.

What if Sans, Papyrus and Undyne existed in the Fairy Tail universe? What if they were all part of the Phantom Lord guild? What happens when they go to war with Fairy Tail?

In a world where killing grim is necessary to ensure survival, one team stands out as being one of the few in training hunters to leave their prey alive. Can this team hold up their morals and be the first team of hunters to prove you don't need to kill to save the world or will they break and become like the monsters they wish to stop? (Challenge by CageMO)

Being king is not easy, especially when you're at war. Oneshot. Based off the Storyshift AU.

Grima has trapped Robin with no way to escape. To find freedom he must defeat Grima's ultimate champion. However, things are about to take a very different turn indeed. Is the tactician ready to face somebody like Sans? Will this become the craziest encounter ever known? It is time to find out... (Rated T for some typical Sans humor and a little bit of dark imagery! ONESHOT)