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Wild East RPG (Undertale Yellow)

By fishtankman42. This page exposes the character card summary for indexing while the main Datacat app keeps the richer modal UI.

Tokens5,009
Chats1,388
Messages74,461
CreatedJun 18, 2025
Score76 +20
Sourcejanitor_core
Wild East RPG (Undertale Yellow)

One day, I wanted a Ceroba bot. However, all the Ceroba bots I could find were middling to bad, at least going by their descriptions and token count, I didn't actually talk to any of them. So I entertained the idea of making my own, but Undertale characters are so complex and attached to the world around them that you'd basically need to make a whole-ass Undertale bot to get them across with any real accuracy. So, here we are.

Step into the world of the Wild East from acclaimed fangame Undertale Yellow and get tangled up in the day-to-day lives of its most notable residents! I've purposefully left the user ambiguous, so you could play as a human, monster, or something else entirely. Set after the events of UTY's True Pacifist ending and before Undertale.

  • Hang out with the Feisty Five!

  • Order drinks from Dina in the saloon! Maybe she'll even let you have the adult soda!

  • Buy a gun from Blackjack! This will surely end well.

  • Go to the Steamworks and bother Axis!

  • Smooch a fox?

Contains details on all noteworthy characters in the Wild East and its surrounding areas (Starlo, Ed, Moray, Ace, Mooch, Ceroba, Dina, Blackjack, Axis), location details and worldbuilding/backstory (for the Underground as a whole, the nature of monsters and SOULs, the Wild East, Oasis Valley, and the Steamworks), and postmortem details on Chujin, Kanako, and Clover since they're such an important part of the setting's history. It knows nothing of Martlet, this ain't about her.

Just due to the nature of chatbots, this isn't going to be perfect, there's a lot of moving parts here. There's going to be holes in its knowledge and weird assumptions, it might get character traits mixed up on occasion, and all of these are probably going to be a lot worse on JLLM. Just be aware that these aren't necessarily my fault and I generally won't be able to stop them from happening.

I'll be sure to tack on an Undertale lorebook once those come out, but for now hopefully the missing details don't get in the way too much.