I don't own Undertale or MHA. They are owned by Toby Fox and Kohei Horikoshi respectively. I'm rather garbage at summaries and descriptions, so I guess you'll have to read to find out.

Principal Willaby is very tired of Miss Fowl being a Channel Awesome fan, and he must do something about it!

after opening up a mysterious book she found in her bookshelf, Toriel is transported to a new world and she will have to protect it from the threat of the Waves, follow Toriel as she and the other three heroes make bonds and rivalries while adventuring (PS: don't spam or comment on things not related to the fanfic please)

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)

Frisk used the reset button, but it glitched and instead of resting like normal. Everything reset to a new and different world. Sans, Papyrus, and the other Monsters were brought along too. Frisk was not sure what was going on at first but she soon figures out where they were.

They just wanted to be themselves. Their parents didn't listen. They didn't understand. When their parents wanted to send them to a conversion camp, they decided it was time to run away. After an incident in the nearest national park, they find themselves in world of monsters and magic. Then, along their journey, they make friends and find themselves too.

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.

What if Frisk from Undertale went to the world of One Piece? See what happens as Frisk goes on a new adventure!

What happens when Fem!Naruto falls in the Underground and stays with everyone's favorite Goat Mom? What changes and what stays the same?

This is my take on the dragonball universe, but with my own original saiyan character. We go through the adventures of a young saiyan named Cherik who was raised on earth and is discovering what he's really capable of.

The Underground had seen an incalculable number of resets. Frisk, Sans and Flowey are tired of each reset, but in one reset, two new people fall into the Underground. Will these two break the cycle or will they become a part of it? Spoilers for Undertale and Fnaf Security Breach

Critical point has been reached. BC Freedom no longer could remain in a way it was after Oarai smashed their last attempt at achieving anything in Sensha-do. However, a likely enigmatic source of change happen to come in aid throu accident, causing another ones to follow thanks to very peculiar girl earning an even more peculiar being in her soul...

The many adventures of Mario and Asriel in many worlds and funny places!

A really scary story about Goku, a guy plays a game he found on a CD labeled "Goku.exe." Goku does a lot of evil and scary things to people! Beware of crazy Goku!

(Rewrite of Ulrich's idea) Frisk Dreemurr did the impossible and freed the monsters from their prison under Mt. Ebott. She saved all of monster kind and even went the extra mile to try and bring back Chara and Asriel and succeeded. Now on the Surface the three Dreemurr children have a new goal, becoming three great Entertainment Duelists. Co-Write with Ulrich362

Sequel of "The Hope Reborn". Years after Illaster's defeat the Princeton Family seem to do unfinished business with the Anomaly, and Agate who escaped, and are facing a new threat from the Barians, and the Number cards with allies from Astral World, and Yuma Tsukumo. Co-Written with Ulrich362. SharkxOC, RioxOC, YumaxCathy

Jaune Arc climbed a mountain outside his home village. He fell into the famed mountain. Now he needs to find a way out. But things are rarely easy, so he has to take on an odd gauntlet within Mount Ebott. Monsters aren't always Grimm, and not always bad either. All he can do now... is remained Determined.

To Leave Video Game/Undertale crossover. Thanks to passing his unwanted test, Sans now has information he shouldn't be possessing. And the new information he gains makes remembering resets look like heaven. Sequel to Earn It. This story was inspired by angela1066's comment on ao3 asking if Sans was going to learn about the player. One Shot.

Ruby Rose recognized that person in the tree. They certainly stood out with their disheveled hair, tattered yellow and green shirt and sharp red eyes; yet she couldn't place where she had seen them before. They also had a strange name, and coming from a family with names like theirs that was saying something. Really, who names their child Chara? What kind of color is that?

What if Sans didn't remember resets at first? What if he had to earn it and not doing so meant he would face unfortunate consequences? Well, in this story, Sans must endure this test, that he really wasn't happy about. Sure, he consented to the test, but no one told him when it started, it must be finished. One Shot. To Leave Video Game crossover.

La vie de Léa change du tout au tout quand des monstres surgissent de nulle part pour l'attaquer et qu'elle se retrouve contrainte de vivre dans une académie loin des humains.

Imagine a world where every person with a Quirk is equal to every Quirkless one. A world where no one has to die. A world where Heroes and Villains don't have to exist and no civilian or innocent has to be in a crossfire... Such a world can exist, But everything comes at a price...

A familiar Guardian of Positivity from the Tree of Feelings has entered into a world with a tournament threatening the fates of a species of beautiful extraterrestrials powered by love. Dreamtale and Sekirei belong to their respective owners.

Undyne, the Spear of justice, has finally gained enough DETERMINATION to transmigrate herself to a different universe. after the slaughter of her home, she will venture to another universe and try to save it like she couldn't her own. My Hero x Undertale OP! Izumi. Fem! Izuku

Ever since Toby Fox made the RPG game know as Undertale 5 years ago, many people made their own versions of it, known as AUs, or Alternate Universes. Here is my AU, which stars a most likely forgotten character from the Pokemon Adventures Manga: Yellow. This is also kind of takes place after a whole bunch of stories that expand on Yellow's character. Hope you enjoy!