"It seems the machine caused temporal instability in the nature of reality. In order to not shatter, it pulled our young Frisk to this time, which relieved pressure on the structure of the timeline and result in only some minor side effects." "You coulda died." Jack sighed. "Very nearly!" Gaster said excitedly, "In fact of all the possible outcomes, this was the most unlikely.."

Frisk always had weak lungs. When they fall into the underground it's fun and fascinating, until they begin to cough and grow ill and then... Frisk knows they don't have a lot of time. On their way to the barrier they happen to meet a fiery barkeep whose magic might be just what Frisk needs. A moment of kindness that changes both of their lives forever. Found Family. FireDad.

Frisk was living on the surface with their new family. Everything was perfect except, the dreams that seem to belong to someone else. Something is left undone. The past is pulling them back. The world is reset, everything is undone. Somehow, they have to break the cycle and save everyone, and themselves. (pacifist run spoilers)

Monsters weren't doin so good, ain't been doin good since the war but that don't mean things ever got easy. Until prohibition mind, now that was a stroke of luck, the Dreemurr family was one of the first to start runnin booze. Doesn't mean there aren't those who'd try to cut in on the profits, but that's where a few bones and a lotta bullets come in. Mobster AU, Sans pov, no mercy.

"Hey, Asriel, can you hear me?" The little golden flower had it's head turned up the sky, a sliver of blue sneaking through a rocks. "You still can't, can you?" The Underground was so achingly silent since the monsters had moved above ground. "You said you called out to me." ... "Is that true?" One-shot, Complete

An Undertale Fairytale inspired by Beauty and Beast There's a castle deep in the woods, no one ever goes there. There is a monster inside full of sin and it's said that should any fool step inside, they damn us all to salvation. Complete