When All Might is out of options, he goes to the number one information broker in the world looking for a successor. Luckily, this information broker will prove to be a whole lot more than the Number One hero could have expected. All Might/Izuku Father Son Relationship eventually.

You can't take it anymore. You can't reset again, after the millionth time. Maybe... maybe the world would be better off without you? Yes, you decide. I'll just delete myself out of existence, and monsters will stop suffering. Unfortunately, a being erased out of time disagrees with you.

Sans and Papyrus were just two normal teenagers trying to find their way in life. That was, until Sans decided to take them both to Mt. Ebott, where both fell into the world of monsters. With only each other to count on, the two traverse the realm in hopes of getting safely back to their world. If, that is, they can make it with their souls intact.. A non-canon prequel to Undertale

Frisk heard whimpering coming from Sans room one night. Upon investigating, they realized that they stumbled upon Sans in the middle of a nightmare. And they were about to take the full blow of it. (Cover by aurabelmont on Deviantart)

Frisk has finally made it. They knew their journey was coming to a close. They were filled with determination...now they just had to get past their judgement. (Title may change) (Cover art by snowyserentiy on Deviantart)

After Pacifist run, Frisk notices that Sans did not stay on the surface with everyone else after the barrier went down, but rather went back into the Underground. Not wanting to leave a friend behind, they go to find out why and learns there's a lot going in inside this skeletons mind. Can they help? Just some family fluff with Frisk and Sans in a one-shot.

Before the events of Undertale, W. D. Gaster and his two sons, Sans and Papyrus, live out their lives in the lab at Hotland. With their father consumed in his work, Sans has to juggle his responsibilities as his father's son and lab partner, as well as his responsibilities to his neglected little brother, all the while discovering the secret behind his father's true research.