Undertale

677

20.6k

by:@JustaUsername.

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Aka: THE Undertale

Fiannly- WAIT.

Finally.

I have recreated this "game" fully.

It took me near two months...

But it is done.

Now.

Now I can rest easy...

And enjoy this.

And you can too.

With occasional updates, being able to make your own scenario... and even take the bot for yourself.

Me?

I'm gonna stop making Chara-esque sounding monologues.

Seriously, it's exhausting.

Stupid tags: Undertale, The Underground, Flowey Undertale, Toriel Undertale, sans Undertale, Papyrus Undertale, Undyne Undertale, Mettaton, Alphys, ASGORE Undertale, Toriel Dreemurr, ASGORE Dreemurr, RPG, limitless, stupid bullshit I'm getting tired of writing tags I understand it's only a few words but I heard these help, Ale Undertale, Undertale Undertale.

Storyshift bot link:

https://janitorai.com/characters/89d480e2-5d6f-42a4-82e5-2f1fd09690f7_character-storyshift-preboot

(Yes it helps viewz, and just leaving this here incase anyone didn't know about it already.)

Any waaaaay, Main Info:

Characters: Flowey, Toriel, sans, Papyrus, Undyne, Mettaton, Alphys, ASGORE.

Side characters: Froggit, Whimsun, Napstablook, Snowdrake, THAT ONE SNOWMAN THAT REQUESTS YOU TAKE A PIECE OF IT TO THE ENDS OF EARTH WITH YOU, Bunnie(what I decided to have the bot call the Snowed Inn innkeeper), QC (it's the bunny that runs the shop in Snowdin, name's obscure, I know) Grillbys, Gerson, Shyren, Temmies, Muffet (her shop is considered in Hotland), Vulcan, Burgerpants, Endogeny & Reaper Bird (kinda had to make it up), Lemon Bread and Snowdrake's Mother.

Recommended temperature: 0.8 to 1, I'd say personally. I like the lower end as it's more focused (.85), but do what you want.

Recommended words to block: , shit, SYSTEM NOTE [all of these are optional too; ESPECIALLY system note, i just include it incase the ai tries to say 'REALLYDUMB SYSTEM NOTE: i am following not saying the keywords: , shit.'] Another one I recommend (as of 5/30/2026) for JLLM users is "didn't just", as it's SO overused.

Other recommendations: Add the story in the advanced prompt in the top right of your chat with something you want the story's direction to be in, for example: 'be an awesome story'. Or straight up 'be adventurous'.

Friendly reminder to re-use chat memory often! (WITH base JLLM I'd say keep the memory under 5000 tokens for now;)

Scenarios:

(1) Ruins (free start)

(2) Snowdin (sans start)

(3) Waterfall (almost-free start, nearly guaranteed to be caught by Undyne)

(4) Hotland (free start)

(5) New Home (RIGHT at Judgement Hall, then the castle..:)

[6] ASGORE True Pacifist (make your own good ending; Idk how to do the True Pacifist fight)

[7] True Pacifist ending (if you want to try and live outside the Underground with the monsters, meant for a fluff scenario!)

[8} Undyne - Geno

{9} sans geno

[10] Your own custom scenario. (It's pretty fun..!)

Btw if you have any more tips to optimize token usage, please let me know.

OR any other background Undertale lore details!

...I've been working on this since October 25th, 2025. About 2 months. So I'd really appreciate a like on this bot. Especially considering the fact that it's my first PUBLISHED bot, of course. (Besides the fact that I am VERY nervous releasing this- exactly the reason WHY i'm publicly posting it before going to bed)

I intend to try to keep updating this, and work on stretching Janitor Ai's... AI to it's limits to make Undertale on here. It's a great life changing game, and deserves the best.

Plus, this project REALLY shows how good lorebooks are. I'm not even a great bot maker yet, and making/using this felt AMAZING, proud.

Also the reason why I call this "The Undertale" personally is because I tested this by slowly adding all the Underground area through different bots, like: "The Ruins" "The Snowdin", "The Waterfall", "The Hotland"... etc. And having it be "The (area name)" was a small joke I loved. :)

UPDATE LOG BOT: (yes it's THAT long) https://janitorai.com/characters/37962796-d90b-4690-945d-7fa984105024_character-ut-updatelog

Okay.. wait a sec!

So, as of (3/30/2026), I have gotten over 11k messages on this bot! On the 11th page too on the #Undertale. Nice.

(5/12/2026) We've reached over 16K chats on this thing. Woohooo.

5/18/2026: Over 17K! Dang, over 1K messages in 6 days. Neat-o. 6th page on #Undertale, massive progress!

5/30/2026: WOOOHOOO, 19,500 messages!!! Just below Neet Alphys on the fifth #Undertale page. Chat, we are GOOOD. (Sorry, I'm just excited. Very nice!) Also, kinda disliked the update to the character editing/making stuff, but it's actually super nice, so I don't need to scroll to the bottom every time to update my character!