This is the legend of DELTA RUNE.

>:3

1. BERDLY will be completely unimportant, and SNOWGRAVE will happen no matter what.

* this is simply due to the fact that snowgrave exists at all. toby fox has stated repeatedly that our choices don’t matter, and that the ending will stay the same. he’s also said that what happens within the story may be more important than the ending itself. both things combined and berdly’s arm being fried in a main route “ending” makes me believe that he’s simply gonna be killed off, whether we make noelle do it or if someone else does it for us

2. DELTARUNE is both a prequel and a sequel.

* i’m still not sure is prequel/sequel are the right words? deltarune definitely isn’t a direct beginning/sequel story to undertale. however, i firmly believe that it’s the prequel to sans and papyrus’s stories, both as brothers and as their own people.

* as for the “both” part, i believe that gaster took us and our/frisk’s soul from post-pacifist, and travelled us to the past, deltarune. i believe that his goal is not to harm others, but to help us create a better end for the deltarune universe and a better future for sans and papyrus. this one is very complicated, but it’s based off the fact that gaster was shattered across time and space, and that twitter! gaster said that he looks forward to “creating a new future” with us

3. KNIGHT PAPYRUS

* this is a HUUUGE theory, and i made multiple branches of it to cover every basis, both close to canon and far from it, so i’m gonna order them from how much i like them!!

— PAPYRUS stumbled into a dark world after GASTER’s passing (and thus, after his darkness related experiments), and was convinced by a fragment of GASTER to become THE KNIGHT for THE LIGHTENERS’s sakes.

* simply explained, undertale papyrus has a huge desperation to help everyone he can. i believe that especially after the passing of a likely loved one, papyrus would be easily manipulated into doing things to make others feel better

— PAPYRUS became THE KNIGHT in an attempt to cope with life through escapism, and to help THE LIGHTENERS escape their own issues as well.

* it’s clear that the main teen lighteners of deltarune have a ton of issues. kris and susie both have issues with their home lives, with toriel being semi-neglectful and kris being isolated from asgore due to toriel’s hatred of him, and with susie likely being homeless, or at the very least, very poor. noelle has a missing sister that could very well be dead, an ill father, and an extremely strict mother that she’s home alone with thanks to her dad being sick. berdly has major self esteem issues due to not being noticed much as a child until he won a spelling bee. due to how little we know about papyrus and his past, other than the fact that he was confirmed t be from the deltarune universe (green grass), i believe that papyrus could very well have used a power he found to create worlds of paradise for himself and the others.

— Either SANS, PAPYRUS, or both, are partially DARKENERS, and are using the threat of THE ROARING to find a way to exist in the LIGHT WORLD.

* this is a far fetched one, but it’s one i really enjoy. they both have major connections to darkeners already. sans is a lot like the spade family, he can teleport like rouxls and lancer, and papyrus says his room is like “another world”, which has a ton of darkness at the beginning. papyrus has major ties to jevil. not sure how to explain it other than that ralsei could very well be wrong about the roaring

— PAPYRUS being THE KNIGHT relates to GASTER’s experiments with darkness/DARK WORLDS.

* this one spiraled into a genuine theory due to a story i was writing about sans and papyrus for an rp. basically, as seen with kris, the creation of dark fountains is a disruption yet harmonization of light and dark. if sans is half lightener, and if papyrus is half darkener, then their similarities yet differences could prove as dark fountain symbolism

— PAPYRUS is GASTER, and he experimented with DARK WORLDS.

* papyrus has the most connections to gaster out of everyone, to the point of being referenced in one of two times his name is mentioned (smiling shred). most fun value events also happen in the two areas papyrus says he’s familiar with, snowdin and waterfall. he also shows a strange sadness when he sees the core in a phone call. i guess a tldr for this is that he made himself a villain, but decided to move on, fake his death, and try to forget he was ever “gaster”. papyrus seems obsessed with redemption, to the point where both snowdin xbox achievements reference a bible story about redemption, so this could be likely.

(i combined two theories into one)

3.5. SANS X JEVIL?

If it helps, try answering these questions:

Who's cakekid?

What did you like about them?

* maybe? i’ve tried that kind of but sometimes it makes me a little sadder (but also makes me feel better after a while?)