Undertale/Deltarune NSFW mods?

[Manguers]

49 minutes ago, losstie27 said:

 

I could maybe work with that. Glyde I still think is a funny suggestion to get before anybody says Muffet or Mettaton though.

 

Very nice! I love the way she moves. I can't say I've ever seen her in an attractive light, but I can respect the vision. (Side note: would she have two or three boobs?)

It would make sense for her to have three breasts, but I decided to draw her with only two.

Anyway, your drawings are really cool too!

[Sunshine Recorder]

15 hours ago, losstie27 said:

I think having a lewd froggit is really important because its the first real enemy you ever fight. Also, it's just about the only one who would realistically have genitalia in the Ruins. The only other would be Migosp and maybe Loox. Moldsmal should go without saying. It's slime. Vegetoid should also go without saying.

Whimsun's body drapes down like a dress, and I don't want to change bodies if I don't have to. And finally, Napstablook is a ghost. He doesn't even have arms or legs. I'm open if you have a suggestion or example of how to make it look more natural, I'm not fully sold on my version either, but it's very difficult with how Froggit's sprites are separated. I will edit his projectile though, don't worry.

Here’s some more lewd sprites I did of Froggit, unfortunately PageItem 301 doesn’t have Froggit busting a nut.

 

(PageItem 281 .png)

 

(PageItem 289 .png)

 

(PageItem 301 .png)

 

(PageItem 309 .png)

 

(PageItem 316 .png)

 

(The edited PageItem 281 and 289 pngs are both two pixels taller than their original png files, so if you decide you want to use them, you could raise Froggit’s dick by 2 pixels, shorten Froggit’s dick by 2 pixels, or you could go to their respective “Texture Page Item” Page, and increase the fourth value of Source position/size and the fourth value of Target position/size from 48 to 50 [That worked for me])

 

——————
 

Edit: Here’s some lewd sprites I did for Final Froggit as well, The second mouth on its stomach is still there, but it’s smaller and black instead of white

 

(PageItem 1076 .png)

(PageItem 1273 .png)

 

(PageItem 1555 .png)

 

 

Edited June 19, 2025 by Sunshine Recorder

[thebreadwinner]

When mettaton's in a form other than the rectangle unicycle, does the clothing-like mold that their hardware is encased in count as clothing or not? If not, there better be at least 1 sprite of her ass out.

[v1ed]

9 hours ago, thebreadwinner said:

When mettaton's in a form other than the rectangle unicycle, does the clothing-like mold that their hardware is encased in count as clothing or not? If not, there better be at least 1 sprite of her ass out.

Mettaton is a male 😭

Still would be a cool sprite tho

Edited June 19, 2025 by V1de0gam3r

[jotaro-]

Someone, tell me what the deal is
Is someone making a mod to overhaul the game into 
underlewd?
But it would be better if you took inspiration from the comic under(her)tale 
cuz it's made every monster a female 
 

[Sunshine Recorder]

1 hour ago, jotaro- said:

Someone, tell me what the deal is
Is someone making a mod to overhaul the game into 
underlewd?
But it would be better if you took inspiration from the comic under(her)tale 
cuz it's made every monster a female 
 

losstie27 is currently trying to make a nude mod of Undertale that makes almost everyone in the game nude and/or have genitalia/boobs.

[losstie27]

18 hours ago, Sunshine Recorder said:

I think I might have managed to find a good lewd design for Froggit. His dick is not too big and I even managed to make the second face in his stomach work in the lewd design, by turning it into a smiley face with a nose.

(I only did PageItem 309 though)

(.png)

 

(Screenshot)

  Reveal hidden contents

 

 

 

Thanks for the sprite! I really like your idea of the face. I can't believe I didn't think of that. I wanted to challenge myself to make my own. I think a part of why the first one looked weird was because he was way too big, so I shrunk him down a fair bit. I think the smiley face reads a little better here too without the ball seam. I also did Migosp for fun.

 

22 hours ago, Sunshine Recorder said:

Nice, I would really like you to do Glyde and So Sorry next. In my opinion, I think Glyde would look good with a slit penis. One of So Sorry’s lines will have to be changed though, since it mentions that he needs to look into his “vest” to get a gift, the line being “Let me look in my vest!”

 

Did you purposefully choose the two hardest characters to get into a fight with because you knew I'd have to get an in game screenshot. Either way, I tried my best with these two. I'm not a big fan of either, but also in my defense, So Sorry is split into like 50 different sprites, so it's kind of hard to get him all pieced together. I'll go back and fix him up later.

 

17 hours ago, Manguers said:

It would make sense for her to have three breasts, but I decided to draw her with only two.

Anyway, your drawings are really cool too!

 

Thank you!!

 

13 hours ago, thebreadwinner said:

When mettaton's in a form other than the rectangle unicycle, does the clothing-like mold that their hardware is encased in count as clothing or not? If not, there better be at least 1 sprite of her ass out.

2 hours ago, jotaro- said:

Someone, tell me what the deal is
Is someone making a mod to overhaul the game into 
underlewd?
But it would be better if you took inspiration from the comic under(her)tale 
cuz it's made every monster a female 
 

 

I'm gonna respond to both of these at once because they're both kind of related. Every monster will be staying their canon gender. In fact, I'll go further and say they'll be keeping their canon designs too (or at least designs that are as close as possible). If I'm making a lewd mod for Undertale, it's gonna stay Undertale. It wouldn't be the same if I changed to characters to be something else. 

Responding specifically to the Mettaton question though, while his casing wouldn't count as clothes, you do also have to remember that he was built in a world where everybody is always naked. Since that's just kind of the default, he would also be nude. I do want to ask everybody what I should do for his box form? That's kind of a hard to lewd. I'm open to any suggestions, even just leaving him as is.

[Sunshine Recorder]

14 hours ago, losstie27 said:

 

Thanks for the sprite! I really like your idea of the face. I can't believe I didn't think of that. I wanted to challenge myself to make my own. I think a part of why the first one looked weird was because he was way too big, so I shrunk him down a fair bit. I think the smiley face reads a little better here too without the ball seam. I also did Migosp for fun.

Did you purposefully choose the two hardest characters to get into a fight with because you knew I'd have to get an in game screenshot. Either way, I tried my best with these two. I'm not a big fan of either, but also in my defense, So Sorry is split into like 50 different sprites, so it's kind of hard to get him all pieced together. I'll go back and fix him up later.

 

Well, I was actually intending for the black pixels (not the white pixels) on my Froggit’s dick design to be the smile and nose since its pupils were black as well.

 

Well, I was originally going to just recommend you do a nude sprite of only So Sorry since he was very easy to lewd, but then I realized that Glyde was another optional boss in Undertale, and so I decided to recommend them both. It had nothing to do with frustrating you, I just wanted to see some underrated characters get lewded, especially since I knew that eventually other people would start to recommend you do the more popular characters like Undyne or Muffet.

 

Question, are the Doodlebogs that So Sorry draws, going to be lewded as well.

 

I would also really like to see nude sprites of Muffet (both overworld and battle sprites), Tsunderplane, and maybe even the Dummy (in the Ruins), and the Mad/Glad Dummy, if possible.

 

Edit: I just realized that So Sorry is wearing a “hat” in this screenshot, is he still going to wear one of five different hats when you fight him in the nude mod?

Edited June 20, 2025 by Sunshine Recorder

[Sunshine Recorder]

3 hours ago, losstie27 said:

I do want to ask everybody what I should do for his box form? That's kind of a hard to lewd. I'm open to any suggestions, even just leaving him as is.

I would say just leave his box form as is, and only lewd Mettaton EX and Mettaton NEO.
 

Also, his box form does have sprites where he wears actual clothing. One being him in an anchorman outfit, and one being him wearing a dress, so those will have to be changed.

 

There’s also a sprite of him wearing a shirt with Froggit’s head on it, and that appears as the accompanying picture to the question “What monster is this?” in Mettaton’s quiz show.

 

 

[losstie27]

5 hours ago, Sunshine Recorder said:

Well, I was actually intending for the black pixels (not the white pixels) on my Froggit’s dick design to be the smile and nose since its pupils were black as well.

 

Well, I was originally going to just recommend you do a nude sprite of only So Sorry since he was very easy to lewd, but then I realized that Glyde was another optional boss in Undertale, and so I decided to recommend them both. It had nothing to do with frustrating you, I just wanted to see some underrated characters get lewded, especially since I knew that eventually other people would start to recommend you do the more popular characters like Undyne or Muffet.

 

Question, are the Doodlebogs that So Sorry draws, going to be lewded as well.

 

I would also really like to see nude sprites of Muffet (both overworld and battle sprites), Tsunderplane, and maybe even the Dummy (in the Ruins), and the Mad/Glad Dummy, if possible.

 

Edit: I just realized that So Sorry is wearing a “hat” in this screenshot, is he still going to wear one of five different hats when you fight him in the nude mod?

3 hours ago, Sunshine Recorder said:

I would say just leave his box form as is, and only lewd Mettaton EX and Mettaton NEO.
 

Also, his box form does have sprites where he wears actual clothing. One being him in an anchorman outfit, and one being him wearing a dress, so those will have to be changed.

 

There’s also a sprite of him wearing a shirt with Froggit’s head on it, and that appears as the accompanying picture to the question “What monster is this?” in Mettaton’s quiz show.

 

 

 

Don't worry, you didn't frustrate me, j just thought it was a funny coincidence that you picked the the boss you have to walk around for 2 minutes to fight and the one that you have to set your clock forward for.

 

Uhhh, I mean, what could I even lewd there? It's an indercernible scribble with horns. I didn't even lewd Loox, who it's very clearly based on.

 

Muffet I'll get around to. I'd like to work some on finishing characters I've already started. Toriel's overworld sprite sheet right now has like 3 things on it. The dummies could be possible I guess, but it'd look pretty goofy, yeah? I'm pretty sure both dummies are confirmed male (ignoring Mad Dummy's transition), so giving them a dick on the bottom of the dummy is about the best I could do. What exactly do you want me to do for Tsunderplane? It's a plane... A very poorly drawn plane at that. I'm not sure how I'd feel putting a giant rack on a plane.

 

Yeah sorry, I'll remove it. I just wanted to get the screenshot out of the way to test and make sure his dick looked alright. If you see any clothing in a screenshot, it'll get removed. I probably just didn't notice. I did the same thing with the Bunbun girl a page or two ago with her bow.

 

The anchorman and chefs outfits he doesn't need. The dress may be an issue because he gives it to the Lion, but maybe he can just be wearing MTT makeup.

 

For the Froggit gag, I'll have to see how it calls in those sprites. I'll probably just make him hold a Froggit sign.

[Sunshine Recorder]

10 hours ago, losstie27 said:

Muffet I'll get around to. I'd like to work some on finishing characters I've already started. Toriel's overworld sprite sheet right now has like 3 things on it. The dummies could be possible I guess, but it'd look pretty goofy, yeah? I'm pretty sure both dummies are confirmed male (ignoring Mad Dummy's transition), so giving them a dick on the bottom of the dummy is about the best I could do. What exactly do you want me to do for Tsunderplane? It's a plane... A very poorly drawn plane at that. I'm not sure how I'd feel putting a giant rack on a plane.

The genders of both Dummy and Mad Dummy are actually ambiguous just so you are aware, so you are totally free to give them female genitalia if you want, or maybe even just not put any genitalia on them at all. Maybe the dummies can be genderless penetrable sex toys, with their holes lacking any resemblance to a pussy or an asshole, that also function as training dummies.

 

For Tsunderplane, there is actually a good chunk of NSFW art featuring living aircraft with giant racks. Just go to e621.net, type in “living_aircraft order:score”, and you’ll find many such examples. I would say maybe give Tsunderplane, the same type of dick that Glyde’s nude sprite has, since that seems to be the most common dick type that is featured in NSFW living aircraft art, but  I’ve noticed that there is very little space near its tail area, so if it doesn’t work out, you can exclude putting genitals on Tsunderplane.

 

 

Edited June 20, 2025 by Sunshine Recorder

[thebreadwinner]

14 hours ago, v1ed said:

Mettaton is a male 😭

Still would be a cool sprite tho

My apologies, i forgot, been a while since i last played

[Sunshine Recorder]

13 hours ago, Sunshine Recorder said:

The genders of both Dummy and Mad Dummy are actually ambiguous so you are aware, so you are totally free to give them female genitalia if you want, or maybe even just not put any genitalia on them at all. Maybe the dummies can be genderless penetrable sex toys, with their holes lacking any resemblance to a pussy or an asshole.

 

For Tsunderplane, there is actually a good chunk of NSFW art featuring living aircraft with giant racks. Just go to e621.net, type in “living_aircraft order:score”, and you’ll find many such examples. I would say maybe give Tsunderplane, the same type of dick that Glyde’s nude sprite has, since that seems to be the most common dick type that is featured in NSFW living aircraft art, but  I’ve noticed that there is very little space near its tail area, so if it doesn’t work out, you can exclude putting genitals on Tsunderplane.

 

 

I just realized that Tsunderplane is based on the “tsundere” character archetype and also wears a pink mob cap with thin ribbons on it, and now I changed my mind, and now I want Tsunderplane to just be a girl with her pussy hidden from the player’s view. I’d be fine with you just writing in lewd dialog, for the flavor text and Tsunderplane during your battle with them, especially when you flirt with them. So, don’t change Tsunderplane’s sprite, just change their dialog.

 

 

Edit: Here’s a little lewd male sprite edit I did of Migospel.

Spoiler

 

 

Edited June 20, 2025 by Sunshine Recorder

[Sunshine Recorder]

I got bored and made some nude male and female sprites of Rudinn from Deltarune Chapter 1 for fun. It was really challenging since Rudinn’s sprite has no black pixel borders and only white and green pixels, so I had to figure out how to keep the color palette of the sprite the same in the nude design, and also because I haven’t really done pixel art before. I decided to give them slit genitalia since they have no legs. Also anyone’s free to use these sprites if they want.

 

(Male Rudinn .pngs)

 

(Female Rudinn .pngs)

 

(Male Rudinn Sprites Screenshot)

Spoiler

 

 

(Female Rudinn Sprites Screenshot)

Spoiler

 

 

 

 

Edit: Made some lewd sprites of Rudinn Ranger as well

 

(Male Rudinn Ranger .pngs)

 

(Female Rudinn Ranger .pngs)

 

(Male Rudinn Ranger Sprites Screenshot)

Spoiler

 

(Female Rudinn Ranger Sprites Screenshot)

Spoiler

 

Edited June 21, 2025 by Sunshine Recorder

[NEOMrRandomMan]

On 4/21/2025 at 8:44 AM, losstie27 said:

Given the release of Deltarune Chapters 3&4 in just a little over a month, now seems like the best time to ask: "Why hasn't anyone made a nude sprite edit mod for either Deltarune or Undertale yet?" The games seem to be relatively easy to mod, with dedicated mod tools existing, and decently good documentation. The characters themselves are immensely popular when it comes to being lewded, so much so, that even a quick Rule34 search gives over a hundred edited spritesheets for just Deltarune alone. Below are just some of the immediate favorites I could find for inspiration. I, personally, think this is an untapped market.
 

  Hide contents

 

OP if you mind telling me the source for the first set of Susie sprites I’d appreciate it. I’m making some edits of my own based on that one and I want to see if whoever made it made any more that I can use as reference.

[Muffet enjoyer]

This seems like a good project! Request: Please can you do muffet and Alphys. It would mean a lot to me.

[losstie27]

3 hours ago, NEOMrRandomMan said:

OP if you mind telling me the source for the first set of Susie sprites I’d appreciate it. I’m making some edits of my own based on that one and I want to see if whoever made it made any more that I can use as reference.

The first four images were all drawn by Slugguts. I'm in their discord, and as far as I'm aware they don't have much that I haven't posted here. If you find some stuff please share though. Or even the sprites that you end up making.

[losstie27]

3 hours ago, losstie27 said:

The first four images were all drawn by Slugguts. I'm in their discord, and as far as I'm aware they don't have much that I haven't posted here. If you find some stuff please share though. Or even the sprites that you end up making.

They posted WIPs in their discord of Mizzle, Popup, and Werewerewire, but these are moreso just sprite concepts for animations of theirs than actual sprite edits like what I assume you're asking for 

[jotaro-]

28 minutes ago, losstie27 said:

They posted WIPs in their discord of Mizzle, Popup, and Werewerewire, but these are moreso just sprite concepts for animations of theirs than actual sprite edits like what I assume you're asking for 

that is really intersting 
i imagine its like act then have sex

[NEOMrRandomMan]

4 hours ago, losstie27 said:

The first four images were all drawn by Slugguts. I'm in their discord, and as far as I'm aware they don't have much that I haven't posted here. If you find some stuff please share though. Or even the sprites that you end up making.

So far I've done all the variations of Susie's Darkworld sprite when facing forward and I've begun work on her Lightworld sprite (I'm not sure about the colours for that one though).

[Sunshine Recorder]

Here’s some amateur male lewd sprites I did of Virovirokun from Deltarune Chapter 2. These edits don’t deviate a lot from their original designs, since I wanted my lewd sprites of Virovirokun to be accurate to Deltarune’s art style, and this is also the reason why my design of Virovirokun’s dick is just a triangle since Virovirokun is made out of abstract triangles.

 

(Male Virovirokun .pngs)

(Male Virovirokun Screenshot)

Spoiler

Here’s an in-game screenshot of one of the sprites as well.

Spoiler

 

 

 

 

Edit: Here's some alternative lewd designs of Virovirokun

 

(Virovirokun with Pink Body and Pink Dick)

Spoiler

 

(Virovirokun with Pink Body and Red Dick

Spoiler

 

Edited June 22, 2025 by Sunshine Recorder

[NEOMrRandomMan]

53 minutes ago, NEOMrRandomMan said:

So far I've done all the variations of Susie's Darkworld sprite when facing forward and I've begun work on her Lightworld sprite (I'm not sure about the colours for that one though).

Finished editing Susie's Lightworld versions and also changed the colours to something that looks better (I also feel like I should mention that I have basically no experience when it comes to pixel art).

Edited June 22, 2025 by NEOMrRandomMan

[NEOMrRandomMan]

I figured out how to replace Sprites in game with custom ones.

However, I'm having some trouble making walking sprites plus side view sprites for Susie that don't suck so if someone could help me out there then I would really appreciate it. You'll only need to make the one sprite for each (one for walking, one for side view, etc.), I'll edit it to make all the variants.

[Buddussy]

17 minutes ago, NEOMrRandomMan said:

I figured out how to replace Sprites in game with custom ones.

However, I'm having some trouble making walking sprites plus side view sprites for Susie that don't suck so if someone could help me out there then I would really appreciate it. You'll only need to make the one sprite for each (one for walking, one for side view, etc.), I'll edit it to make all the variants.

Bro's just streaking on the whole class

[Catnatic]

3 hours ago, NEOMrRandomMan said:

I figured out how to replace Sprites in game with custom ones.

However, I'm having some trouble making walking sprites plus side view sprites for Susie that don't suck so if someone could help me out there then I would really appreciate it. You'll only need to make the one sprite for each (one for walking, one for side view, etc.), I'll edit it to make all the variants.

Uh oh, someone forgot to get dressed. (Or did she?)