Doctor W.D. Gaster is an enigma shrouded in mystery, with very little known about him. Despite the scarce amount of information, this character is a popular topic for many fans who are desperate to know who he is. After the January 2016 patch, more “fun” events became available in regular gameplay, driving more people to look for answers as to who Gaster is.
The following is a breakdown of facts, circumstantial evidence, and unconfirmed theories on Gaster. All technical information mentioned below is based on v1.001 of the game.
Before Gaster is discussed, three important characters should be considered – the followers.
Facts about the followers:
There are three followers.
Their sprite names are spr_g_follower_1, spr_g_follower_2, and spr_g_follower_3.
Their object names in the code are obj_gaster_follower_b, obj_gaster_follower_a, and obj_gaster_follower_c.
Each follower has a very low chance of appearing.
Follower_1: fun value 62 and 50% chance = 0.5% chance
Follower_2: fun value 61 and 20% chance = 0.2% chance
Follower_3: fun value 63 and 50% chance = 0.5% chance
Since the followers are the only characters that mention Gaster by name, what is known as canon about Gaster is derived from their dialogue. However, because the followers speak in such a hearsay manner (e.g. “They say he created the Core.”), it’s hard to be sure how accurate this information is. With little else to go on, this information will be taken at face value.
Facts and hearsays about Gaster:
He was the previous Royal Scientist, before Alphys.
His brilliance was “irreplaceable”, which is why Asgore took so long to replace him.
He created the CORE.
His life was cut short.
He fell into his creation.
His experiments went wrong. (Yes, experiments is plural here).
He vanished without a trace.
He shattered across time and space.
A piece of him exists with Follower_2.
He is still listening.
Outside of what the followers share, there are a few more things known by special events in the game and by examining the code and assets.
From the game’s code, assets, etc:
Entering Gaster’s name in the character name screen causes the game to restart – and it only happens with Gaster’s name.
The Sound Test Room in Snowdin has a 50% chance of being accessible at fun value 65 (after defeating Papyrus and before defeating Asriel in the pacifist route), and Gaster’s Theme can be played in this room. Once the song starts playing, the music cannot be changed. Eventually, the song ends and then Frisk is automatically returned to the room with the fishing rod.
Despite not having a battle, Gaster’s monster type identifier in the code is 666, and his stats are composed using only 6. (ex. HP of 666666)
Sans’ attacks, which bear resemblance to animal skulls, use six sprites called spr_gasterblaster.
An unused NPC field sprite called spr_gb_npc looks like the spr_gasterblaster sprites, but without a face.
The gasterblasters are used in the code’s obj_gasterblaster, which is used in the code’s obj_gasterbl_gen.
By editing the game’s save files, ENTRY NUMBER SEVENTEEN can be found in an unused room. The code for this room is called obj_gaster_room, confirming that the entry belongs to Gaster. The identifier for the text type is 666, and the game quits after the last line of the entry.
The following is a list of reasonable deductions based on clues provided in the game. Unlike the facts listed above, these theories are not confirmed directly. However, they have enough circumstantial evidence to make a strong case.
Gaster is the original creator of the DT Extraction Machine.
Alphys specifically mentioned “using the blueprints” in her lab entry 5.
Since Alphys used these rather than created them, it’s presumed to be from the previous Royal Scientist.
W.D. Gaster refers to Wingdings and Aster (two fonts).
Wingdings shares Gaster’s initials, W.D.
Because the room with ENTRY NUMBER SEVENTEEN is coded as obj_gaster_room, Gaster has a connection to Wingdings.
Because Sans and Papyrus are named after fonts and are skeletons, Gaster is assumed to be a skeleton.
The Core was built before New Home.
Considering New Home is built above the CORE, it’s reasonable to assume Gaster built the CORE before the Royal Family moved to New Home.
Gaster may have a connection to the monster that appears in a room behind a gray door in Waterfall – Mystery Man.
The sprites are called spr_mysteryman.
The object name in the code is obj_mysteryman.
At fun value 66, there is a 10% chance of this door appearing. That means there is a mere 0.1% chance of finding this door without hacking or cheating.
Frisk cannot collide with Mystery Man; they walk right through.
When interacted with, Mystery Man disappears, and the sound effect snd_mysterygo plays. It is the same one that plays for the disappearing Follower_2, who claims to be holding a piece of Gaster.
Unlike with the followers, the phone can be used, but there is no response.
Gaster may have a connection to the monster in an inaccessible room in Waterfall – Redacted A.
Its sprite is called spr_redacted_a_0.
Its object name in the code is obj_redacted_a.
The room can be accessed by editing the game’s save files, but only after disabling dogcheck.
The monster is solid and cannot be walked through.
It disappears if Frisk moves away from it, and reappears if Frisk moves towards it.
This is the only monster that speaks in Wingdings, specifically all lowercase. Its only dialogue is “* [redacted]”.
The text sound used for Redacted A’s dialogue is the same one used for ENTRY NUMBER SEVENTEEN.
Sans has a connection to Gaster
Sans uses gasterblasters in his battle.
Sans has blueprints with unreadable symbols in his secret lab. The narration remarks that it may be just the handwriting that makes it illegible, perhaps implying it belongs to Alphys who’s handwriting is described as illegible chicken-scratch. However, unreadable symbols could also mean Wingdings.
During his battle, when Sans sleeps, he snores in an unidentified serif font. This font was originally thought to be Aster, but further examination has proven this is not the case.
Popular but Unconfirmed Theories
With how little information there is and how hard it is to find, it’s easy for “fanon” to become so popular that it is misrepresented as canon. The list below is made of popular theories that are commonly misquoted as fact. This was not written to diminish the theories in any way; in fact, the reason these ideas are so popular is that they make a lot of sense and are not directly contradicted by evidence in the game. However, it’s important to know fact from fun.
“Mystery Man is Gaster.”
Because the followers, the Sound Room, and Gaster’s stats all share a pattern of 6′s, Mystery Man has an association with Gaster.
However, Gaster was said to have shattered. If this is the case, it doesn’t seem right for him to still be intact as the Mystery Man.
It is more plausible that Mystery Man is a “piece” of Gaster.
Redacted A is the only monster in the game to speak in Wingdings, which makes it another candidate to being a piece of Gaster.
Goner Kid is the gray monster kid that can be found in Waterfall.
Their sprites are called spr_mkid_goner – it does not include the word “follower.”
Their object name in the code is obj_mkid_goner.
They have a gray color scheme like the followers.
However, Goner Kid appears if the fun value is above 90 – not in the 60′s. This means there is a 10% chance of running into them.
Unlike the followers, the phone can be used in the room with Goner Kid to call Papyrus.
Goner Kid never mentions Gaster.
“Gaster was forgotten by everyone.”
Based on the idea that Gaster shattered across space and time somehow causes his existence to be forgotten. There is no mention of this, however.
There is also speculation that Gaster is talking through Goner Kid about how the world can be the same “except you don’t exist.” However, Goner Kid has no confirmed association with Gaster.
The word “forgotten” is never used to describe Gaster.
His followers remember him.
Nothing indicates that Asgore forgot him, especially considering he took so long looking for a replacement since Gaster’s genius was “irreplaceable.”
“Gaster is in the void.”
There is no mention of a void in the game, other than what Mettaton says at the end of his battle: “IF I LEFT… THE UNDERGROUND WOULD LOSE ITS SPARK. I’D LEAVE AN ACHING VOID THAT CAN NEVER BE FILLED.“ This is not a literal void.
The followers only ever mention that he “shattered across time and space,” “fell into his creation,” and “his life… was cut short.”
Gaster is not stuck in any void.
“Gaster wrote the true lab entries.”
Other than the ENTRY NUMBER SEVENTEEN that is written in Wingdings, there is no evidence that Gaster wrote any of the entries found in the true lab.
Alphys explains to Frisk the experiment she carried out on the fallen monsters, which the true lab entries document.
They mention information about Gaster, but in a hearsay manner.
The “follower” name makes them seem more like fans or cult members.
Sans has a photo album filled with photos of people Frisk does not recognize, which people believe is Gaster and the followers. However, Frisk can meet any one of them, even if the chances are extremely slim.
“Sans was Gaster’s assistant.”
Sans says “you’ll never see them again” in the Lost Souls battle as if speaking from experience.
ENTRY NUMBER SEVENTEEN addresses two people at the end, but nothing confirms who these people are.
Gaster is speculated to be a skeleton, so it’s commonly assumed he would be their father. However, Sans and Papyrus make no mention of family outside of each other.
A poorly drawn picture of three people smiling can be found in Sans’ photo album under the right circumstances, but there is nothing to say who these three people are.
Shrouded in mystery and darkness, Gaster’s identity and story continue to elude the community. Filling the gaps with speculation is part of what makes Gaster theories so much fun. Hopefully, this comprehensive master post will aid with the guidance, testing, and formulation of fan theories. While conjecture and assumptions breed compelling speculation, it is always important to distinguish fanon from canon.
There is a boat in the coat of arms. There is no sea nor large river anywhere near. Ex navicula navis. You wonder where would that boat go if it weren’t land-locked.
In winters air turns to pure poison. You breathe in, air feels fresh. Woman next to you wears a gasmask.
Derby is coming, so you don’t leave your home. From the window you observe police cars pass by, you stop counting at eight. The monsters are out, bloodthirsty. They hunger. You double check the locks.
There is now a tunnel under the city. You peek inside. You wonder if those that enter, come out the same. When you drive through, you try to not look. Lights slide against your eyelids.
Old ruins is where hipsters run, or at least they look like it. What crawls under their skin, you don’t know. Soon their colourful nest will be gone, it is on attractive grounds and some see a skyscraper here. You wonder where will creatures resembling hipster go.
Trams and buses pass you by. The older the vehicle is, the further away it will take you. Away from the city, into the unknown. Sometimes you see the tram that could just as well be functional during nazi occupation. Where is it going to take you, if you were to enter?
Magenta, Cyan and Yellow flood your senses. Everything bleeds in primary colours.
An old railway station got rebuilt. It’s now always empty. There is an empty bus that circles between this station and the airport. The airport is empty as well. Ghosts need to leave this city, but this privilege is not for you.
There is art on walls. You don’t understand, but such were always things with art. Somehow it doesn’t surprise you. The colourful splashes help hide the rot.
Everything was a factory once. You walk the city. You wonder if you were part of a factory at some point in the past. Sound of tram passing by resemble sound of old machinery and you feel calm.
There is man standing at the Freedom Square . His stare is judgmental. You can’t escape it. You were never free anyway.
Old woman at the bus stop shows you photos. Black and white, of bad quality, you barely recognize your own city, and yet you know. This is it. The Past, such strange concept, as how can the past exist if you live in it?
Cranes are rising above the rot. They must feel so proud, trying to raise above all the crumbling buildings, reducing them to dust.
There is no Old Town. What people call Old Town is barely seen, doesn’t compare at all to glorious Old Towns of Kraków or Wrocław or Gdańsk. This city is not old at all. Towns surrounding it are much older. There used to be more, but anything younger got devoured by metropolis. Only old ones still stand, borders pressing against each other painfully.
Once upon a time you could go into the market and buy anything. Now the witches that traded their fares here are caged in glass and steel. You miss old times, when you passed by an old woman selling things you never saw before. You dreamed of those things for weeks, but now all of this is gone.
You sometimes ask yourself what would happen if Nazis stayed a little longer. You fear the answer. When new tram tracks were set, workers found bodies of Jews from occupation times.
On cold autumn evening, lights flash across buildings. The Museum of Archeology and Ethnography crumbles in front of your very eyes. It rises again. People grin in the darkness and leave. There are lifeless lights hiding in the park on this very day. You are not sure if it’s safe to look.
Unicorn Stable, they call it. You never saw any unicorn, and yet rainbow falls on your irises. Here, many just pass by, it’s a mere tram station. Maybe if one were to wait a little longer, one could see something otherwordly. More people get in and out of trams, cars around you move slowly. Nobody stops to look for unicorns. Maybe that’s why they are gone.
You walk in the park, between your feet goes the line that once separated world of living and dying. Litzmannstadt Ghetto Border. You are straddling a thin line between world of living and the dead, as you know no one survived life on the side your right foot stands on, dying in gas chambers or out of overwork. You glance to the right and shopping mall greets your eyes, another old factory remade.
The city is dying and you can feel it. Years earlier it has been second largest city in Poland. Now you don’t even want to check. The rot is everywhere, but you’re not sure if it will ever truly die. “Promised Land” will live, even when all the citizens will be dead.
I finished some sketches for Sans and Red’s small child. Their name is “Sirius A” because as much as I like font names, Sans and Red are giant space nerds so of course they would name their kid after the brightest star visible from earth.
Sirius A is kind like Sans, but also sort of an asshole like Red, so they throw a lot of tantrums when they’re a kid.
Absolutely loves puns, but is somehow really bad at coming up with their own. Its painful to watch.
They also really love space and science like their Dads and plans to be an astronaut one day. Red didnt cry when they told him, he was simply leaking liquid happiness.
Im really bad at making character sheets, so they will probably never have one. Either way, feel free to use them if you want???
Sirius A is non binary. I don’t think I actually said that they were? So they go by they/them
Summer of 1983, Northern Italy. An American-Italian is enamored by an American student who comes to study and live with his family. Together they share an unforgettable summer full of music, food, and romance that will forever change them.
It’s really interesting to think about Taylor Swift and the future of music as belonging to online streaming because Taylor made her albums iconic using the physical album format. She uses the album booklet to hide secret messages and to tell a story through the prologue. She had specific body parts on her physical CDs and used a specific font for her name. She wrote her first prologues in her own handwriting for the booklets. She put collectible polaroids in her album case and had entire photoshoots to make lithographs for every other song in her album booklets. She documented making 1989 with polaroids and put the polaroid of her studio sessions next to the song it was for. Each album booklet, CD cover, and all album art follows a specific theme derived from the story of the album’s songs. A Taylor Swift album belongs in the physical form.