Undertale/Deltarune NSFW mods?

[losstie27]

18 hours ago, losstie27 said:

I decided to take a quick look at this tutorial and threw some rudimentary Frisk sprites in game (I don't think I ever realized how much they're shaped like a raw chicken). The tool is actually super easy to use. I can't promise an actual full mod, but something like this would be WAY more attainable than someone like Kris due to how significantly more complicated Deltarune's animations are. As a sidebar, there is a full, working walk animation here, I just obviously can't show it because Loverslab doesn't support gifs.

Still just messing around with the tool, but yeah, editing text is way easier here then I imagine it would be normally. 

[Buddussy]

3 hours ago, losstie27 said:

Still just messing around with the tool, but yeah, editing text is way easier here then I imagine it would be normally. 

I'm liking the way this looks, btw, you should try slimming Frisk down a little.

[Grefers]

On 6/7/2025 at 1:17 AM, losstie27 said:

I decided to take a quick look at this tutorial and threw some rudimentary Frisk sprites in game (I don't think I ever realized how much they're shaped like a raw chicken). The tool is actually super easy to use. I can't promise an actual full mod, but something like this would be WAY more attainable than someone like Kris due to how significantly more complicated Deltarune's animations are. As a sidebar, there is a full, working walk animation here, I just obviously can't show it because Loverslab doesn't support gifs.

WHy he fat? I love em big.... I love em chunky!

[losstie27]

20 hours ago, Buddussy said:

I'm liking the way this looks, btw, you should try slimming Frisk down a little.

 

1 hour ago, Grefers said:

WHy he fat? I love em big.... I love em chunky!

I actually did slim Frisk down by a few pixels, but they're just kind of shaped like that. Unfortunately that's just a consequence of the almost chibi artstyle Toby goes for. I try to avoid drastically changing a character or art style as much as possible, not only because it makes edits easier, but also it's just my preferred style of mod. 

For anyone else who wants to take a crack at editing the text, I've figured out what the weird syntax letters Catnatic was struggling with mean. A carrot(^) followed by a number is a pause. Almost every pause in the game is ^1, although for something really dramatic they do ^2. There's never a pause more than ^3 unless it's a special case like a menu or something. An ampersand(&) means a break to the next line. There is an autowrap function if your line is too long, but it'll often just cut off your word midway through, so you should always use an &. Dialog boxes can only support 3 lines before leaking out of the box, so watch out for that. Lines of dialogue always need to end in a backslash(/). Finally, a forward slash followed by a letter means a change in color. I'm not sure how many colors are supported, but /W, /Y, and /R are white, yellow, and red. If you use color at all in a string, make sure to set it back to white after.

[Catnatic]

On 6/7/2025 at 1:34 AM, Buddussy said:

For the sake of anyone who wants to get into it, here's a tutorial for UMMT, with a modded/more featurefull version in the uploader's discord

 

Edit: Looking at the tutorial, I still can get over the chaos of UT and DR's sprite sheets, I dabble in RPGMaker and the sheets those use were never so overstuffed

I believe that's just how GameMaker store sprites.

Frames of sprites are individual images instead of full sprite sheets.

It can be quite cumbersome if you're a modder hoping to edit them in a convenient sheet but in the perspective of a developer, frames of animation are stored in each sprite set and typically organised in folders.

 

On 6/7/2025 at 12:52 AM, losstie27 said:

I see! I should've realized Toby's messy code would be a problem there. From a quick google search, I think the SCR_TEXT file is just an internal thing and not actually displayed?? I think the code reads that file to compare it to a different text string that it reads. At least, that's what some guy on reddit said. I also think Undertalemodtool might have a built in string editor but I'm not sure.

If Undertale is a possibility in the future, I'd love to contribute to all of the random NPCs/other one off sprites.

As you've already seen for yourself, SCR_TEXT is a script for calling strings. The other file is where you add or change text.

 

15 hours ago, losstie27 said:

I actually did slim Frisk down by a few pixels, but they're just kind of shaped like that. Unfortunately that's just a consequence of the almost chibi artstyle Toby goes for. I try to avoid drastically changing a character or art style as much as possible, not only because it makes edits easier, but also it's just my preferred style of mod. 

Here's my version of naked Frisk. I made them shortly after I did Kris but I couldn't share them earlier. I had the same idea of slimming down their body shape.

 

 

Modest and not as thick, but I think some might like that.

 

On 6/5/2025 at 12:01 PM, losstie27 said:

I will say, without spoiling chapters 3&4, Deltarune would be an absolutely massive undertaking to nude mod with the drastic increase in content we just got.

I think YouTube spoiled some things for me

Went from "haha, there's unused funny scenes if you say "FCK" in the quiz show xD" to recommended some videos that implied:

Spoiler

You're not Kris, Kris is their own conscious being that you control with their soul.

If that's what we're going with, this gave me an idea for my own possible nudity reaction mod for why Kris would be the only one nude.

I should clarify that I only watched someone played and finished Chapter 1 years ago so I forgot what the overall story is like.

Edited June 9, 2025 by Catnatic

[losstie27]

14 minutes ago, Catnatic said:

I believe that's just how GameMaker store sprites.

Frames of sprites are individual images instead of full sprite sheets.

It can be quite cumbersome if you're a modder hoping to edit them in a convenient sheet but in the perspective of a developer, frames of animation are stored in each sprite set and typically organised in folders.

 

As you've already seen for yourself, SCR_TEXT is a script for calling strings. The other file is where you add or change text.

 

Here's my version of naked Frisk. I made them shortly after I did Kris but I couldn't share them earlier. I had the same idea of slimming down their body shape.

 

 

Modest and not as thick, but I think some might like that.

 

I think YouTube spoiled some things for me

Went from "haha, there's unused funny scenes if you say "FCK" in the quiz show xD" to recommended some videos that implied:

  Reveal hidden contents

You're not Kris, Kris is their own conscious being that you control with their soul.

If that's what we're going with, this gave me an idea for my own possible nudity reaction mod for why Kris would be the only one nude.

In UTMT you can just upload your own organized sheets for a sprite to use. It's actually super convenient. Say you want to change the walking down animation for Frisk. That's four individual frames (though frame 1 and 3 are the same). You can upload a spritesheet with just those three sprites and attribute each frame to an area on the sheet. This doesn't mess up any other animations either because each frame checks for its own spritesheet.

 

I like your choice of including male and female parts for Frisk, though I'll always be a sucker for the male parts. I will note though that it looks like their legs get way longer in their forward and backward sprites because of the way you drew their butt. This could look a little weird in game if you tried to put them in.

 

Spoiler

To be fair that's been pretty obvious since even chapter 1, with Kris ripping us out at the end. Even Undertale states that we the player are a different being from Frisk (Flowey tells us to "Leave Frisk alone. Let them live their life." after a true pacifist.) It just seems like Deltarune is focusing on it harder by having Kris actually react to our presence. Do share your idea though, I'd love to hear.

 

[Buddussy]

Those dialogue changes have me wondering, what if we could just do explicit not explicit references to sex? Like Toriel acting frustrated and blushing before she heard Flowey, like she was busy when she interrupted Flowey, or when you go visit Undyne after her date with Alphys, she could be naked and sweaty, it's never mentioned outright, but you know exactly what they were doing.

 

A very hard ecchi, basically.

Edited June 10, 2025 by Buddussy

[Buddussy]

On 6/9/2025 at 2:07 PM, Catnatic said:

I believe that's just how GameMaker store sprites.

Frames of sprites are individual images instead of full sprite sheets.

It can be quite cumbersome if you're a modder hoping to edit them in a convenient sheet but in the perspective of a developer, frames of animation are stored in each sprite set and typically organised in folders.

 

As you've already seen for yourself, SCR_TEXT is a script for calling strings. The other file is where you add or change text.

 

Here's my version of naked Frisk. I made them shortly after I did Kris but I couldn't share them earlier. I had the same idea of slimming down their body shape.

 

 

Modest and not as thick, but I think some might like that.

 

I think YouTube spoiled some things for me

Went from "haha, there's unused funny scenes if you say "FCK" in the quiz show xD" to recommended some videos that implied:

  Reveal hidden contents

You're not Kris, Kris is their own conscious being that you control with their soul.

If that's what we're going with, this gave me an idea for my own possible nudity reaction mod for why Kris would be the only one nude.

I should clarify that I only watched someone played and finished Chapter 1 years ago so I forgot what the overall story is like.

Uoooh, Friskunny 😭😭😭

[losstie27]

2 hours ago, Buddussy said:

Those dialogue changes have me wondering, what if we could just do explicit not explicit references to sex? Like Toriel acting frustrated and blushing before she heard Flowey, like she was busy when she interrupted Flowey, or when you go visit Undyne after her date with Alphys, she could be naked and sweaty, it's never mentioned outright, but you know exactly what they were doing.

 

A very hard ecchi, basically.

Maybe! I was thinking something like "The magical barrier cast by the humans also completely eviscerates clothing as one last way to humiliate the monsters for losing. And then of course over the hundreds of years they were stuck down there, society just adapted to being naked." There could probably be some sly references though.

[Buddussy]

3 hours ago, losstie27 said:

Maybe! I was thinking something like "The magical barrier cast by the humans also completely eviscerates clothing as one last way to humiliate the monsters for losing. And then of course over the hundreds of years they were stuck down there, society just adapted to being naked." There could probably be some sly references though.

Hm, yeah, but it's personally hotter if the taboo still exists and there's other sexier reasons why they're naked.

[losstie27]

More sprite edits. While I am having fun with these, the work is super tedious, and I'm not really too keen on actually editing a ton of dialogue. If anyone else wants to contribute sprites (like Monster Kid's 20 frame trip animation lol) or go through and edit dialogue to be more nudist friendly, I would really appreciate it.

[Catnatic]

On 6/9/2025 at 4:35 PM, losstie27 said:

  Hide contents

To be fair that's been pretty obvious since even chapter 1, with Kris ripping us out at the end.

It just seems like Deltarune is focusing on it harder by having Kris actually react to our presence. Do share your idea though, I'd love to hear.

 

Spoiler

I'm not sure if this is really applicable since I'm not too familiar with Deltarune's plot but I thought of a narrative where you, the soul, force Kris to be a nudist against their will. 

Perhaps since at the start of the game so everyone would be surprised to see Kris in the nude for the first time, as if it's Kris' weird way of opening up themself.

 

7 hours ago, Buddussy said:

Hm, yeah, but it's personally hotter if the taboo still exists and there's other sexier reasons why they're naked.

I probably would add some sort of clothing abandonment element there. Like have Flowey tell Frisk to burn their clothes at the start of the game under the guise that you don't wear clothes in the underground when in reality, monsters do wear them like humans so they'll be shocked to see a human walking around naked.

[losstie27]

58 minutes ago, Catnatic said:

 

  Reveal hidden contents

I'm not sure if this is really applicable since I'm not too familiar with Deltarune's plot but I thought of a narrative where you, the soul, force Kris to be a nudist against their will. 

Perhaps since at the start of the game so everyone would be surprised to see Kris in the nude for the first time, as if it's Kris' weird way of opening up themself.

 

I probably would add some sort of clothing abandonment element there. Like have Flowey tell Frisk to burn their clothes at the start of the game under the guise that you don't wear clothes in the underground when in reality, monsters do wear them like humans so they'll be shocked to see a human walking around naked.

Spoiler

The game (and supplementary ARG content) implies that Kris hasn't been themselves for a while, since the start of the game at least, with Noelle noting in Chapter 4, during a Snowgrave route, that it felt good to hear their REAL voice again when they came to her house to apologize. There's a ton of dialogue about how weird Kris has acted since they got the soul, but everyone brushes it off because Kris has kind of always been weird. 

I think that'd be a really fun narrative to work with if you did it, ironically enough, fitting surprisingly well with some of the themes they've established so far.

 

That'd really only make sense if Frisk was the only one naked, no? I've already made a ton of sprites for the rest of the monster cast nude, so the "naked in a world of clothed" route you're going for there would be kind of a waste. Plus, you'd already be naked when you land in the Underground, since you don't change sprites after talking with Flowey, so I think the idea of barrier shredding your clothes would be cleaner.

[Catnatic]

1 hour ago, losstie27 said:

  Hide contents

The game (and supplementary ARG content) implies that Kris hasn't been themselves for a while, since the start of the game at least, with Noelle noting in Chapter 4, during a Snowgrave route, that it felt good to hear their REAL voice again when they came to her house to apologize. There's a ton of dialogue about how weird Kris has acted since they got the soul, but everyone brushes it off because Kris has kind of always been weird. 

I think that'd be a really fun narrative to work with if you did it, ironically enough, fitting surprisingly well with some of the themes they've established so far.

 

That'd really only make sense if Frisk was the only one naked, no? I've already made a ton of sprites for the rest of the monster cast nude, so the "naked in a world of clothed" route you're going for there would be kind of a waste. Plus, you'd already be naked when you land in the Underground, since you don't change sprites after talking with Flowey, so I think the idea of barrier shredding your clothes would be cleaner.

Yes, I should clarify that the narrative I'm going with for Undertale is for the idea where Frisk is the only one naked while nudity is considered taboo since that's the kind of niche I'm into for exhibitionism. I don't mean to suggest it should be part of the project where everyone is nude since obviously that narrative wouldn't make sense there.

[shootingstarCR]

has anyone suggested nude battle sprites? i once saw a cool asgore porn animation related to that so would like to suggest that concept

[losstie27]

12 hours ago, shootingstarCR said:

has anyone suggested nude battle sprites? i once saw a cool asgore porn animation related to that so would like to suggest that concept

I've actually been toying with those too! Personally, I enjoy making larger, more complicated sprites over smaller, animated sprites. That said, battle sprites are difficult because they are HORRIBLY made. Despite being literally the same sprite with like a 3 pixel difference in the face, one sprite will have like 3x the line width for some reason, and if you don't have the line width right then it screws up the whole sprite in game.

(Gore technically)

Spoiler

 

[Buddussy]

1 hour ago, losstie27 said:

I've actually been toying with those too! Personally, I enjoy making larger, more complicated sprites over smaller, animated sprites. That said, battle sprites are difficult because they are HORRIBLY made. Despite being literally the same sprite with like a 3 pixel difference in the face, one sprite will have like 3x the line width for some reason, and if you don't have the line width right then it screws up the whole sprite in game.

(Gore technically)

  Hide contents

 

Wow, those are really nice

[losstie27]

Temmie update! (Fallen human is there too)

[shootingstarCR]

9 hours ago, losstie27 said:

I've actually been toying with those too! Personally, I enjoy making larger, more complicated sprites over smaller, animated sprites. That said, battle sprites are difficult because they are HORRIBLY made. Despite being literally the same sprite with like a 3 pixel difference in the face, one sprite will have like 3x the line width for some reason, and if you don't have the line width right then it screws up the whole sprite in game.

(Gore technically)

  Reveal hidden contents

thanks tons, between us thanks even more for the 3rd pic 😉 Huge amount of work done here already

[losstie27]

Is there any characters/specific scenes you guys would want to see. The end goal here, assuming this becomes a fully fledged mod, is to have as many monsters made naked as possible, even if it's just a random NPC or common enemy. I'm also still looking for anyone else who'd like to help contribute 

[losstie27]

1 hour ago, shootingstarCR said:

thanks tons, between us thanks even more for the 3rd pic 😉 Huge amount of work done here already

I'm gonna try to ignore the worrying implications of that and just say thank you for the compliment

[shootingstarCR]

3 hours ago, losstie27 said:

Is there any characters/specific scenes you guys would want to see. The end goal here, assuming this becomes a fully fledged mod, is to have as many monsters made naked as possible, even if it's just a random NPC or common enemy. I'm also still looking for anyone else who'd like to help contribute 

Wait how about Snowdin bunny girl off the top of my head?

[losstie27]

14 hours ago, shootingstarCR said:

Wait how about Snowdin bunny girl off the top of my head?

I'm assuming you meant the Shopkeeper, but just to be safe, I did all of the rabbits because why not

[v1ed]

On 6/12/2025 at 6:51 PM, losstie27 said:

I'm assuming you meant the Shopkeeper, but just to be safe, I did all of the rabbits because why not

This is so awesome! Maybe you could try undyne next?

 

[Buddussy]

On 6/13/2025 at 6:51 AM, losstie27 said:

I'm assuming you meant the Shopkeeper, but just to be safe, I did all of the rabbits because why not

Man you got the style down pat, I love it