Undertale AU Ideas Wiki
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Ai made this image. But i made the story and allat.

Creator: me aka peyton (https://www.deviantart.com/peytonproductions)

📘 CHAPTER 1: UNDERLOOP

“You can’t kill a god. But you can understand it.”

The anomaly (Frisk/Player) is reshaping reality through resets. Sans becomes a self-rebuilding genius inside a reset-proof chamber. Papyrus is used as the ultimate anomaly detector. Sans attempts to trap the anomaly through psychological profiling, but ultimately cannot win. The chapter ends with Sans accepting the eternal stalemate, choosing to live meaningfully despite futility. Leads into…

📗 CHAPTER 2: UNDERTALE – TIME PATROL

“A perfect world... but memory always finds a way to loop.”

Setting: The Sanctuary Timeline Zero (Perfect Loop) Frisk, after countless resets and manipulation by Sans, finally seeks true peace. They sacrifice their reset power to rewrite history into a permanent golden timeline — a new AU: Asriel is alive. Chara never dies; becomes caretaker of the Ruins under Toriel, who is now Queen. Chara is deeply racist against humans, except Frisk, who hypes them up. Asgore is mysteriously dead from the start — possibly due to Frisk’s resentment. Gaster never falls into the Core; is whole. Monsters had never a prior war with humans, but now live peacefully underground, thanks to Toriel’s wise retreat and noticing the building hate/rage from the humans back then. Everyone is adult, emotionally healed, and self-actualized.

The Time Patrol:

A group created to preserve the Sanctuary Timeline from anomalies, paradoxes, and recursion.

Members: Sans – The tactician; less jaded but still sharp. Frisk – Redeemed anomaly; now an empath/ambassador. Still cam come back from death but cannot reset nor rewind time.

Asriel – The “Heartkeeper,” wielding SOUL energy with responsibility. Papyrus – Chief morale officer; compassion barometer. Gaster – Reintegration success; now core scientist and multiversal analyst. Inciting Incident: Déjà Vu

A new anomaly appears — not Frisk, but the Player, the true meta-entity. The Time Patrol becomes looped, trapped in the same cycle Sans once faced. Sans steps into the mentor role, akin to Gaster’s past position. The team now confronts deeper questions: Can the new anomaly be reasoned with? What if a perfect world is broken by curiosity or boredom? Is peace sustainable if memory and control always return?

(This au is a stub, Still WIP very much.)