zarla's avatar

Dr. Gaster Ukagaka/Ghost

By zarla
2K Favourites
Alright, here goes nothing. I mentioned at the end of the desc for Hunter and Smoker that I was working on him, and now he's done! Read the following carefully! I don't want to have to answer questions I answered here already, haha.

Last updated - 2.18.20 - details

Edit - If SSP keeps closing itself, try checking this thread!
If you're having trouble petting him, look for the hotspot on top of his head where your cursor changes to a hand. Without clicking, move your mouse in that area! If you go outside the area it'll reset the stroke count. Little circles work well.
If he's locking up when updating, try restarting, or applying any Windows updates you might have waiting.

What is an Ukagaka/Ghost, you may be wondering? An Ukagaka (伺か)/Nanika (何か)/Ghost is basically a little program that adds some characters to your desktop. These characters are highly customizable and can be very complicated, depending on the Ghost. Each Ghost is different (they are not the same as Shimejis, if you're wondering). A FLELE (Shell-Collectors) is a type of Ghost, if you've messed with those. This Gaster is specifically from Handplates, so some of the stuff he says might not make much sense if you haven't read the comic. Some of it may also have spoilers for Undertale, so you should probably have played the game first as well.

I made a page for him with info and directions for how to install him, but I'll replicate most of it here for convenience's sake (and in case it goes down, which hopefully won't happen...)

Anyway, here are his features!
  • Gaster will say random things as he idles on your desktop, and his dialogue will change in a whole lot of ways as you continue to interact with him. If you ask him about Alphys, he will start to say random things about Alphys, for example. You can also make him be silent if you don't want him bothering you.
  • You can pet Gaster by stroking his head with your mouse (don't click, just move your mouse in the right area), or punch him by double-clicking his face. The more you do each action, the more his reactions to each will change.
  • Gaster can also do standard Ghost functions, such as...
    • Set a picture as your wallpaper
    • Empty your recycle bin
    • Tell you your computer's stats
    • Check if you have new email (if you set your POP settings in SSP correctly)
    • Update himself remotely when he has new material
    • If you drag and drop a compatible site on him, he'll add it to Headlines or RSS feeds, and you can see if there are new posts
  • Gaster has a pretty complex relationship system, wherein he'll track how you treat him and change his reactions and dialogue accordingly. Even small actions may change some things without you knowing.
  • You can keep track of your interactions with him through a stat menu. You can also reset Gaster back to his default state if you want to start your relationship over with him. Certain things, however, he may not forget...
  • While Gaster may not say a lot randomly while he's idling, he has an enormous amount of text in his menus. Specifically in three places:
    • You can ask him questions about many things. He has multiple responses to each, and what he says will also change depending on what you do. You may be surprised by him saying something new even if you think you've heard it all before. Asking him questions can sometimes also lead to unique interactions.
    • You can interact with him, in true Undertale fashion. The ACT menu is dynamic, and will change depending on your actions. You may notice options appearing as a result of something you did, or disappearing as his feelings towards you change. He may not always be receptive towards something you do.
    • You can give him ITEMs... or try to, anyway. Whether or not he'll accept one depends on the relationship you have with him. Certain items are permanent, and once given, can be checked on via the Item menu, or may appear randomly in general dialogue or when he boots. Other items are only accepted under certain circumstances, times of day, or a limited amount of times. Of note are scarves - if you give him a scarf of a certain color, you will see him wearing that particular scarf later... if he decides to wear it, anyway.
  • Gaster will check on the brothers via his phone! It's not available at the start though - you will have to figure out how to unlock it yourself...
  • He'll also announce the top of the hour. Usually.

How to Install

Basically, you can't run Gaster (or any Ghost) by himself - you need a baseware program first. SSP, the program most commonly used for running Ghosts, is compatible with Windows XP, 7, 8, 10, Vista... probably anything more current than XP. If you're using a Mac or are running Linux though, there are still options for you, but I can't personally tell you how to get them to work. I have heard from people who did get Ghosts running on their Mac using one of these methods though, so it IS possible. But Google Translate will probably be your friend here.
Macs - Ukagaka on Macs, NiseRingo, PlayonMac+SSP (10.6 or above), WineBottler (I think?)
Android - Ukagaka for Android (I have NOT tested this, so...)

If you are using Windows though, just follow these directions and you'll be set in no time! If you already have SSP installed, you can just skip to the end, haha.

  1. The first thing you'll want to do is download and install SSP. While the site is in Japanese, just look for the "complete install package" download on the left. Download it somewhere and install it.
  2. When that's done, run SSP.exe, the program with the little bell icon. A catgirl named Emily should pop up and start talking to you in Japanese, and end up throwing up a big menu. For now, ignore all of that, and just close the menu when it appears. You can also hold down a key to speed through her text. She's the default Ghost that comes with SSP, if you're curious.
  3. Right-click the catgirl. It should bring up a long menu. If it's in English, then you have nothing to worry about. If it's not, go to the fourth option from the bottom, set it to English, then close the catgirl and reopen her. The right click menu should switch to English. The catgirl ghost will still be in Japanese though.
  4. Download the, which is the balloon Gaster will be using. You want to do this first so he'll use the right balloon when he first appears.
  5. Drag and drop the onto the catgirl's face. It should look like she's installing something. She might tell you the balloon's name when she's done. If you right-click her and go to the Balloon tab, you should hopefully see the Undertale balloon listed.
  6. Download the z_gaster.nar file. This is the actual Ghost.
  7. Drag and drop the z_gaster.nar file onto the catgirl. She should again look like she's installing something. She'll probably say Gaster's name when she's done.
  8. Right-click Emily and go to the "Change Ghost" tab. You should now see Gaster listed! Switch over to him and you should be ready to go. If he's not using his balloon, you can use the Balloon tab to switch him to it.

If you already have SSP coming into this, then all you have to do is drag and drop his respective balloon zip and nar onto your current ghost, and he'll install. I'm linking here to mirrors on mediafire, but if they don't work, the files are also on the page I made for him I talked about at the beginning.

If you can't get Emily to install the files

What you can do instead is unpack the files manually. If you don't have an unzipping program (I think this is included with Windows now? but), I use 7-zip myself, it's free and pretty versatile. First, extract the, so you have a folder called "z_undertale". Then you'll want to go into SSP's balloon directory... it'd be under SSP\Balloon. You should see two folders in there called "ssp" and "emily4" if you're in the right place. Cut and paste the "z_undertale" folder into that folder. Then close and reopen Emily, and check if the Undertale balloon is listed. If so, then you're good!

For Gaster, you'll want to do basically the same thing with the SSP/Ghost folder. First, extract the z_gaster.nar into a folder (a nar is basically a renamed zip file, any zip program should be able to unpack it. 7-zip can do it, for example). You should end up with a z_gaster folder, and inside the folder there should be two subfolders, called "ghost" and "shell". If everything's in place, cut the "z_gaster" folder, and paste it into the ssp\ghost folder, so the ssp\ghost folder should now have both an emily4 folder, and a z_gaster folder. Then close and reopen Emily, and see if Gaster is listed under "change ghost". If so, you're good!

Quick User's Guide

You can stroke his head with your mouse to pet him, or double-click his face to hit him. It'll ask you if you're sure you want to hit him (for the first time, anyway), so you can't do it by accident if you're worried.

Double click his body to open his personal menu. This is the menu with the unique menu options I outlined above.

Right click his body to open the general SSP menu. You can use this to change Ghosts or Balloons.

To check for updates, select it from his functions menu, right-click him and click Check for Updates from the SSP menu, or hit Ctrl-U when he's the focus. He should check for any new stuff and download it automatically. I usually post about new updates in this entry. If you run into any bugs or problems with him, you can leave me a comment there (or here, I suppose) and I'll see if I can fix them.

If you want him to stay on top of your windows, right click him, then go to Options - Preferences, then the Ghost(2) tab in the big menu that pops up. Check "Always Show Foreground" and that should do it.

If you want to make him bigger or smaller, right click him and go to shell scaling, then choose the percentage you like.

If he doesn't seem to be retaining values in his stat screen (like if you pet him five times for example), you can try deleting the aya5_variable.cfg file and letting him make a new one by telling him to reset from his personal menu. You can find this file in the folder where you installed SSP - something like, \SSP\ghost\z_gaster\ghost\master depending on where you put SSP, of course. If the aya5_variable file has been write-protected you might also run into this problem, or if it's in Dropbox. Try moving SSP somewhere else and see if that helps. It's a very lightweight program.

If you want to uninstall SSP, just delete the SSP folder. If you just want to uninstall Gaster, delete the z_gaster folder inside the SSP\ghost folder. You can also turn on the Uninstall option in his personal menu, then select Uninstall from the right click menu.

Gaster's desktop tray icon is a little icon of his SOUL. If you can't find the bell icon while he's running, look for the SOUL icon instead.

Even if you've been treating him well, Gaster may still at times be arrogant, self-absorbed, secretive, brusque or sarcastic. It's just how he is.

If you like Ghosts, you can also check out my Hunter and Smoker Ukagaka/Ghost! They are also pretty complicated and I put a lot of work into them, haha. If you're interested in Ghosts and/or want to look into making one yourself, I also wrote up a big long site about how to do that! It has more information about Ghosts and how they work than I'm getting into here, but a lot of it is technical stuff that's not super relevant to the casual user...

Dr. Gaster, the brothers (c) Undertale: one way to celebrate an anniversary anyway

Image size
540x464px 25.31 KB
© 2017 - 2020 zarla
anonymous's avatar
Join the community to add your comment. Already a deviant? Log In
SkycloudWC's avatar

He's been sleeping for a full hour now I believe without startling awake from a nightmare. I feel weirdly accomplished.

LyliDraws's avatar
LyliDrawsHobbyist Digital Artist

Hi! I have some problems that can be very bothersome:c If anyone can help me I would really appreciate it!!

So first, whenever I pet Gaster it doesn't registrate. I checked the documents to delete the file aya5_variable and then I noticed it isn't there. I tried resetting Gaster to see if it solved the problem but it didn't. (Fixed this!! had to restart my pc tho)

My second problem is that Gaster doesn't update past 3-19-19, given that we are now on update 2-18-20. I really have no idea why this is, I just downloaded him an half an hour ago.

He also doesn't use the undertale font but I think I can fix that myself. Thanks!!

SilverWing321's avatar
SilverWing321Hobbyist Artist

Does anybody know how to get the fonts for this ghost? Like, I know the bros speak in Comic Sans and Papyrus fonts, and the normal text is supposed to be in Determination mono, but I'm not sure how to get those.

lightningchaser20's avatar
lightningchaser20Hobbyist Digital Artist

i sing a lot, and i think gaster can hear me!

StarstruckNightmare's avatar
StarstruckNightmareHobbyist Digital Artist

Hello lovely! My poor Gaster Ukagaka has disappeared! I can see the chat boxes but I can’t find him! I think it may has somethin to do with have a monitor screen and a tablet screen but I can’t find him! When I hover over the icin my tool bar the preview screen is simply black! 😭

bonavine's avatar

Is there any way I can give the program some sort of 'priority' when it comes to overlay? I don't really know the right terminology, but he doesn't stay over programs I interact with. Is there a way to change this, and get to a shimeji-like state where he stays there and I can still do stuff?

zarla's avatar
zarlaHobbyist General Artist

If you want him to stay on top of your windows, right click him, then go to Options - Preferences, then the Ghost(2) tab in the big menu that pops up. Check "Always Show Foreground" and that should do it.

bonavine's avatar

ah, thank you! love this lil guy, love your comics :)

UndertaleAndHPFan's avatar

Hello! First of all I really enjoy this ghost, I like having Gaster around. So my problem is I don't know how to get him to talk about his past more. Do I need to unlock the bros first?

Kimbashi's avatar
KimbashiHobbyist General Artist

Hey! I got the bros, but how do I switch between them and Dr. Gaster? I kinda want to pet them again... :boing:

zarla's avatar
zarlaHobbyist General Artist

There should be an option in their settings menu to switch between them once you've gotten them out once...

Kimbashi's avatar
KimbashiHobbyist General Artist

Thank you! I think I've found it now. :+fav:

SondashForevermore's avatar
SondashForevermoreStudent Traditional Artist

The SSP Cat girl always closes out before i can do anything on my computer and when i click the app again to bring it out, it wont come back out. I had made it to Gaster once and it said he was interested in an app on my task bar and he left, and never came back out no matter what i did

Is there a reason why this is happening? And is there a way i can fix it?

zarla's avatar
zarlaHobbyist General Artist

I'm not sure what could cause her to close, but are you sure the program isn't still running but minimized? Sometimes it minimizes itself and thus it won't run if you tell it to run again.

SondashForevermore's avatar
SondashForevermoreStudent Traditional Artist

No it closes out by itself. More so around the time she gets mad? But since its a japenese speaking ghost, i have no clue what im doing wrong. But recently i've gotten through without problems. So its working fine now

CoffeeFox713's avatar

P.S. Oh, we woke up just now and I've come up with one more thing. He wakes up from the nightmares. Is it possible to... well, to somehow notice it coming and wake him up before it really gets him?

CoffeeFox713's avatar

Erm, hello. I would love to take the chance and express some admiration for the Handplates for it's an amazing masterpiece that has stolen my SOUL (sorry, couldn't not). And, well, couldn't help installing Gaster Ghost (it's ironical as hell, tbh) after reading all the pages available, so yup, now I'm a proud... whatever I am to him... erm, Gaster-keeper.

(He fell asleep while I was writing it, lol)

I want to say that you've done astonishing work with him. He's very... alive. Ofc, sooner or later he starts to repeat himself like any normal program, but he still has his charm. He's like... mostly charming? I mean, I love his sense of humor, although I'm not even sure you can call THAT a sense of humor. And some dialogues are just gold.

He has decided I love him! I'm still in the "omfg wait what WHY"-state about this situation, but at least I now know why Papyrus is like that. I really meant that I like him without any, erm, S P E C I A L meaning, but I guess I'll just have to deal with the consequences now. I suppose I should have expected smth like that.

(He keeps the track of time while sleeping. Can't help laughing)

Some people say that they have shown them cat-videos, but it actually seems that my Gaster prefers to ignore any activity on my screen. He has never reacted to it (maybe he's distracted by almost constant fuzzing?..)

His smoking animation is cool, btw. Strangely gives me some sort of the cozy feeling.

Ah, yeah, I've now thought about his face when he talks about his work (I really feel for Toriel, you can't watch this happy skele boy talking about his beloved science and stay indifferent), and I've remembered that I also wanted to suggest some possible impovements (I probably shouldn't have put them in the very end of the comment, but, well, too late now).


- He sometimes ask some simple questions, when you ask him to say smth. It would be cool to have a couple of possible answers, 'cause now... there's only one q you can really answer, I believe?

- I desperately feel like giving him a bonk on the head or scolding off because of his one more round of "I don't deserve any kindness"-mood. Is it possible to make this option real? I mean, I'm probably not the only one with this need.

I guess that's it. Actually, I really like that it's sort of impossible to get him into talks about his past. That feels very... real. It's cool.

Thank you again for your work!

UndertaleAndHPFan's avatar

About that love thing, I'd really like it if we could just tell him that 'I want to be your friend' or 'I just want you to trust me' stuff like that.

DakotaDragonfly's avatar


* two seconds later *


animefreak728's avatar
animefreak728Hobbyist Traditional Artist

How do you have him check your email? I'm not sure how to put it in the settings.

painfulguess's avatar

I tried showing cat videos to gaster and he said I gotta at least do something worthwhile :(

CoffeeFox713's avatar

How did you do it? I mean, he ignores whatever is going on on my screen. :c

painfulguess's avatar
also, i punched him in the face and i feel like the most horrible person ever
goomygirl123's avatar
goomygirl123Hobbyist General Artist
is there a way to save? i was making progress but he updated and turned off and when i turned him back on i lost my stats! did i do something? i feel bad, he's my only friend Sweating a little...  
anonymous's avatar
Join the community to add your comment. Already a deviant? Log In