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This is the page where I talk about theories/observations I or others have made about Deltarune or Undertale. Obviously not all of this shit is necessarily true or intended but I like to notice and write about things in these games. Enjoy my deltq pqtriots... Work incoming
Gaster is Satan theory/conjecture
Religion: Religiosity is a key undercurrent of deltarune. Whether it be Father Alvin, the near-religious prophecy espoused by ralsei and the devotion darkners are "supposed" to give ligthners or the explicitly religious origin of the delta rune in Undertale (a symbol with a trinity which is representative of an angel which will free monsters from an almost judean-esque exile from the surface), deltarune is even more full of religious undertones than undertale. This is important in many ways to me, and I think the ideas of fate and determinism in the philosophical sense that toby fox plays with will work well with a dose of spiritualism. Undertale was primarily about the soul after all; perhaps in a different form than we think of it, but still. I will elaborate more on the religious undertones as they relate to kris at a later point, but the point stands that deltarune is a game that features religiosity in some meaningful ways. It alludes specifically to Christianity through the presence of a Father. Their places of worship are called churches and those establishments are very much a part of their lives as seen by the fact that singing in the choir is rather common at a young age apparently. Its also worth noting that Toby is a weeb and may take inspiration from Eastern spiritual traditions like Buddhism and Shintonism; note how father Alvin says that their religion does not have sin. This establishes a recurring idea of religion and brings the reasoning for the Gasterian 6 motif which I will discuss soon
Numerology: Pretty simple fact, but what really drew me into the theory is that gaster's attack stats in deltarune are all 6s. 6 repeating, so often 666 is included. This is a rather odd choice for sure, one I never really understood until I actually thought about it more. I believe that deltarune was also version 6.66 at one point or another but this might just be me being silly and I'm not gonna look to check it, the point is that gaster is associated with 6 multiple times (deltarune is often thought to be inherently connected to gaster; many go as far as to suggest that Gaster created it). There's also potential ideas of angel numbers with the presence of the sets of 7 in both gamaes (7 human souls in UT; 7 days/a week until asriel arrives and 7 chapters in DR). 7 in particular is of note in some ways: 7 is an often reoccurring number in media, especially RPGs. Many things come in sevens, whtether this is relevant or not is yet to be seen. It is simply what set me down this path
Faustian Bargains: Religiosity is associated with deltarune and potential malevolence are associated with gaster. This does us very little as far as my views go. Consider the case of Spamton: a man who makes a deal with Gaster and loses his mind. Spamton trades temporary exponentially increasing success for long term stability and the hope of "freedom". He goes insane in pursuit of this freedom, to the point where it ensnares him and leaves him less free than ever. This is essentailly a modern form of a Faustian bargain: Spamton sold his "soul" (his charisma and ability as a salesman) for temporary gains and ends up paying the ultimate price in the form of defeat. His "deal with the devil" leaves him empty. His lust for freedom traps him. Many people view satan as giving worldly "freedom" in exchange for real, true freedom in the afterlife (satanists often present a positive spin on this by saying satan represents resistance of authority, attempting to escape the contraints set by God - in either case this reading can apply, you just have to take it in a slightly different direction). Gaster appears to offer this tantalizing freedom, only to take it away when Spamton is about to truly make it big; much like the devil in traditional depictions, gaster leads spamton astray and ultimately leads to his moral and economic downfall. He becomes humbled at the foot of the player, ultimately being taken along for the ride by the party or failing in his schemes in some other capacity. Deltarune seems to be embued with an almost Calvinist attitude, taking on a form of predestination in which your choices don't matter. Tldr: gaster is an malevolent entity which promises vast riches or intense wish fulfilments and always underdelivers, paralleling traditional depictions of satan in most Christian contexts
Science: Gaster was the royal scientist. This is one of the few things we certainly know about gaster, being directly stated in undertale. Why is this relevant? In historical context, many religions often derided science as heretical at one point or another. Either for doctrinal (science went against current dogma) or cultural reasons which I will discuss more later, religions have had a somewhat tense relation with secular sciences of all sorts. Gaster represents worldly, cultured modernity. He's the peak of scientific achievement in his society and undeniably provides massive benefit to the residents of the underground through creations like the core; he also attempts to play God and revive people, engaging in horrific experiments are carried out by his successor Alphys. He was a great man of science, being part of the royal court which toriel (the most obviously religious UTDR character for a variety of reasons explained here) opposes for its murderous tendencies. Gaster represents a scientific, worldly view of things that clashes with spiritualism. The core, gaster's main creation, is ultimately what undoes him. He falls into his own creation. This could be interpreted as a symbolic image of what mankind does best: destroying itself with its own inventions, egotism and hubris gone too far. TLDR: gaster embodies traditional depictions of "mad"/evil scientists and the consequences of secular science in some meaningful ways which connect back to his significance as a demonic force
Imagery: This one is a bit vaguer and less concrete. I'm largely just going to be showing pictures and explaining how I think they relate to my point, but sometimes I will use more figurative examples of "imagery" to make a point. This first image shows the determination extractor, which looks a strange amount like an animal skull. It particularly looks like a goat skull or something similar to me, and goats are often associated with the devil or evil in general in the Western Christian world. Moving on from the literal to a more figurative piece of imagery, we don't know what gaster actually looks like exactly. He takes many forms; there are two sprites which are thought to maybe be him in undertale and there are sequences in deltarune which are thought to be his doing (the man with the egg is the one which immediately comes to mind). His leitmotif is everywhere; it seems as if gaster is an everpresent force in the environment, warping into whatever form makes sense at the moment. This is similar to how some Christians view satan. They percieve demons and satanic influences in much the same way, never taking a concrete form. It changes with the observer and their thoughts, their desires, their fears. Gaster also seems to take on this quality post-fracturing across time and space. He takes various forms, none of which are the "real" version of himself
Religiosity in the Dreemur household
Religion is pervasive in Deltarune and Undertale. Spiritual ideas play into both games heavily (note how the SOUL is the focus of Undertale for example), that much is not debatable. Deltarune makes this a bit more obvious with the direct reference of the Christian faith through Father Alvin, a monster who serves as a religious leader at what appears to be a church of some sort. Father Alvin is an interesting figure for sure. Some believe he could be the knight and I can understand why, but this point is not relevant at the current moment. Father Alvin interests me as a catalyst for understanding the religious situation in the Dreeumr household.
In chapter 1, Father Alvin has a bit of dialog. Kris is not often in his presence; this is communicated in a few ways, most obviously Father's surprise at Kris coming to see him. Kris apparently does not participate in the church - except for mooching off of their "sick Fruit Juice", a potential mirror of communion wine - at least not to the extent they did at one point. Its well known that Asriel is often overshadowing Kris and Father Alvin mentions that his departure made the choir quieter, then turns to Kris and asks for their entry into said choir. This is an immediately obvious example to add into the Kris being overlooked pile, but it also communicates a bit about Kris as a person. Kris is known to have studied occult with Catti at one point or another and generally seems to be a bit of an outcasted/naturally solitary figure; compare this to Asriel, a child who gets all the metals, is rather social (potentially to a fault) and was comforming to a somewhat conservative form of their religion that believes in sin, which even Father Alvin is confused by in chapter 2. This is another contrast between them which I wanted to pry into. Asriel is the big brother which everyone loves and is proud of, he's what Kris is supposedly meant to be more like. Kris is just... different.
Kris goes by they/them pronouns. "...do they like it?"; "They're drinking it..."; "Let Kris do what they want, Susie!"; there are no instances in which Kris is referred to by he or she. Kris is notably not a player insert character, so that argument does not make much sense. This is an abnormal condition in deltarune, there aren't any other characters which go by they/them that I can remember. This would lead me to believe that Kris is non-binary; they are at least some form of queer in some sense, unless humans are radically different and being cishet isn't a thing which would not make much sense and we have 0 proof of. The Christian (particularly Catholic) coded setting of churches and Fathers in which Asriel thrived is the one which restrains Kris and leave them in the shadows. Kris gravitates to occultism and "demon summoning" as an avenue of escape (occultism is also called "dark"/black magic by some western groups, which could be relevant). This added context plays into the family dynamics: a supposedly cishet older brother of high respect and renown that practices a somewhat moralistic form of the dominant religion and a younger queer sibling that eschews the dominant faith for something they find more personally interesting.
Why does this matter? In this context I believe that the religious makeup of the town and the dreemur home is important. Toriel is one of the most notably reliigous characters in Deltarune. She makes the family go to church after Asriel gets his first kiss for a week in deltarune; she wears the delta rune, a symbol of the Prophecy in Undertale (the symbol also appears in Deltarune, most interestingly in this analysis in Kris's room in Castle Town). The delta rune is prominently associated with the dreemur family, giving an extra weight to their religious connections. Toriel seems to have an iffy relationship with kris. Its loving but distant in some ways. The detail which really tipped me off and made me wonder was the obnoxiously gendered shampoo that she attempts to make Kris use which has gone largely unused. Kris is the only potential target for this shampoo; Asriel has seemingly been off at college for long enough that this was almost certainly not his in any capacity. Asgore also appears to have not lived in the house for some time, so it wouldn't make much sense for this to be his doing. Toriel is likely attempting to force her interpretation of what is acceptable onto Kris just as she did onto Asriel, and this simple detail reveals it rather subtly. Toriel seems to be a bit problematic as a parent in a few ways. None of the things Kris is interested in are indulged in; note Noelle saying that Kris came over to play the piano often, joking that they only came over to do that activity. The dreemur home is lonely, Toriel acknowledges such at one point. This flawed parenting could extend to Kris; Toriel thinks she can raise Kris the same way as Asriel, and this includes raising them in such a gendered way
Asgore is an interesting piece of this puzzle. If you're a true deltarune patriot you know of the clock app and Asgore's part highly implies he's bi in one capacity or another. This is the most gay shit in history and there's no way around it. 
Asgore was his santa, this shit is 100% gay. Also he is literally me but that's not relevant right now. The point being that Asgore has some amount of queerness in there and is implied to have potentially had a relationship that was more than friendly with rudy. Maybe this is part of why they split? Asgore (as far as we know; this could change in theory) is not a child killer in deltarune, but he could be a bisexual goat that cheated on his wife/got divorced by her after she learned he had dated rudy or something at some point. Asgore doesn't seem like the type that would cheat but it is an option to consider, the exacts of the split don't matter for the dynamics at play. Kris has had the one non-cishet (or whatever version of that exists in deltarune) figure in their life removed; the fact that this was also their presumably adoptive father doesn't make it any better. The functional loss of their father disrupts Kris clearly, from the loneliness of the house to the potential suppression by their mother. Asgore is one of the best characters in ut and I love him but I don't have much to add for now