Summary
- Almost every party member is hiding something from the player.
- Many of these theories can plausibly overlap with one another.
- The endgame will likely feature W D Gaster, somehow.
Fan theories abound for Toby Fox’s interconnected games Deltarune and Undertale, with gamers speculating wildly as they anticipate the release of Chapters 3 and 4. The plausibility of these theories spans a wide spectrum, from those that seem quite possible to the notorious “Sans is Ness” theory, which Toby Fox himself has debunked on platform X (previously known as Twitter).
Ultimately, theorizing is just a fun exercise, not about who’s correct. This compilation will explore various popular and obscure Deltarune theories, from widely accepted ones to more offbeat conspiracy theories. Consider it like an iceberg, with the majority of its mass beneath the surface. While we won’t know the truth behind these theories for now, they all make for an enjoyable read.
7. Darkners Are Objects Brought To Life
And Don’t Exist In The Light World

Beginning with a theory so self-evident it has been tacitly corroborated: The inhabitants of the Dark World, known as Darkners, bear a striking resemblance to their counterparts from the Light World. For instance, the Card Kingdom introduced in Chapter 1 was found within a storage room typically used for school supplies. This storage area contained card games, board games, and so forth. The monstrous creatures that appear in Chapter 1, shaped like spades and clubs, reflect this theme.
In Chapter 2, it’s revealed that the Dark World is connected to the Light World’s computer lab. This means all the creatures in there are related to computers and the internet. It’s a bit eerie to understand that Ralsei, your reliable ally, only exists within the Dark World and seems to be modeled after Kris’ red-horned headgear. However, this is merely scratching the surface of the mysteries yet to unravel.
6. Kris Is The Knight
Who May Bring About The Roaring

A widely accepted theory now is that Kris serves as the Knights who shall ignite The Roaring. These Knights possess the ability to create Dark Fountains, which are gates linking the Realm of Light to the Domain of Darkness. It’s believed their goal is to initiate The Roaring, a cataclysmic event that will devastate both the Realm of Light and the Domain of Darkness alike.
Given that players witnessed Kris unveiling a mysterious fountain towards the end of chapter 2, this theory may seem straightforward. Yet, Toby Fox has demonstrated his knack for cunning tricks – remember, the stinger at the end of Chapter 1 showed Kris holding a knife, but it turned out to be for cutting a cake in Chapter 2. Therefore, it’s plausible that this theory might intentionally lead us astray.
5. Chess Theory
Perhaps Each Chapter Has Battles with Chess Pieces, But Perhaps Not

Keen-eyed viewers may have spotted an unusual chess theme running through the episodes. In the first chapter, the group confronts a King, and in the second, they battle a Queen. Also, there’s frequent mention of a potential main antagonist, the Knight, from the game Deltarune. The speculation is that each boss in Deltarune corresponds to a chess piece until the players encounter the Knight. However, this supposition is rather fragile.
To date, no reference has been made to a Bishop, Pawn, or Rook. It’s important to note that there are six distinct chess pieces, but only seven chapters in the story. Some speculate that the antagonist of Chapter 3 might be a Rook due to Mike being described as a ‘cheat’, which is another term for a Rook in some contexts. However, this idea seems rather speculative. It’s equally possible that people are confusing the royal family (kings, queens, princes) with chess pieces. Until Chapter 3 is published, this theory remains unverified.
4. Ralsei is Evil
Ralsei Tea’s Lower Benefits Indicate a Lack of Trust for the Prince

In the mysterious realm of the Dark World, much can be pondered concerning its enigmatic prince, Ralsei. His actions often seem unusual, bordering on the point where it appears he is defying the rules of the game to converse with the player. There are numerous instances where Ralsei encourages Kris to ignore questionable occurrences, suggesting a possible manipulation. Furthermore, there’s a hint that Kris may harbor negative feelings towards Ralsei due to an item called ‘Ralsei Tea’.
In this scenario, there are four distinct teas labeled Susie, Kris, Noelle, and Ralsei. The consumption of these teas can restore a character’s health points, with the extent of healing depending on their affinity for the tea. For example, Noelle has feelings for Susie, and when she drinks Susie Tea, she is healed significantly (400 HP). On the other hand, Kris’s healing from Ralsei Tea is minimal, suggesting a lack of fondness towards the prince. However, this does not necessarily mean that Ralsei is evil; it could simply indicate a complex or manipulative character, as there are often valid reasons for being disliked or suspicious.
3. December Is In The Bunker
Find Her is a Song That Clues Players into Noelle’s Sister’s Fate
In the storyline, it’s implied that December is Noelle’s sister who has gone missing. Although her name isn’t directly mentioned in Chapter 2, she casts a shadow over the entire series. The townspeople seem to believe she’s deceased, but there are hints suggesting she may just be lost instead of missing. Two songs echo this theme: ‘Lost Girl’, which is Noelle’s theme, and during the Spamton Sweepstakes event, a secret URL reveals a sprite of a guitar and a song titled ‘Find Her’ – December’s theme. This collective evidence leads players to surmise that December is lost rather than missing.
Regarding her whereabouts, there’s a strong possibility she’s been in the enigmatic Dark World all these years, explaining why she hasn’t been found. Frequently, Susie and Kris revisit the secretive bunker, a place they lock away. It’s plausible that December may have been confined within the bunker and inadvertently drifted into the Dark World. If Kris suspects this scenario, it makes sense why they’re opening mysterious fountains in various locations; they are likely searching for Dess.
2. Noelle Is An Angel
Who Will Bring The Angel’s Heaven

In simpler terms, Deltarune features a trio of heroes (Kirs, Susie, and Ralsei) tasked with locking away an angel’s realm. It’s plausible that Noelle might act as the overseer of this angel’s heaven due to several reasons. To begin with, Noelle is often associated with celestial imagery. She possesses healing powers, she wears white robes, and characters frequently describe her as an ‘angel’.
With the storyline of Deltarune’s “Snowgrave” path, where Noelle is tricked into transforming into a ruthless killer, it’s evident that she possesses tremendous power. It might even transpire that by the conclusion of the Snowgrave route, players can guide Noelle to accumulate enough strength to summon whatever the angel’s heaven entails.
1. Gaster’s Role
Very, Very Interesting…

W. D. Gaster can be compared to a character from an internet urban legend that appears within a video game. His existence seems fragmented across different moments in time and space, with a single image of him hidden in the game’s data. The skeletal appearance of Gaster shares similarities with the characters Sans and Papyrus, who are known as the skeleton brothers. However, despite numerous theories, the exact role that Gaster will play in the upcoming game Deltarune remains a mystery.
During the game, players hear a piece of Gaster’s theme at the start when they build their ‘vessel’. Additionally, Toby Fox hinted about his upcoming project, Deltarune, being extremely intriguing on his account. These statements are attributed to W.D. Gaster, which suggests that he may have some role in the game, although the details remain unclear.
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2025-04-01 17:39