Complex Soul - A Deltarune AU Fanfic

Complex Soul - A Deltarune AU Fanfic

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WpMetadataReadMatureOngoing45m
WpMetadataNoticeLast published Sun, Nov 23, 2025
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Fanfic
Deltarune
After everything had been fixed and the adventures come to an end, the player, the soul, has finally stopped tormenting Kris for their own selfish wishes. Constant saves made over and over against Kris' will has permanently damaged them mentally and has found themselves to develop a clinical disorder that will forever make day to day life more difficult than ever. Fear will always linger, but will the soul strike back once again? Will there be a happy ending for Kris? Trigger warning for themes of CPTSD, Self harm, Trauma, Hospital themes. (The tws will update more as the story progresses). Themes of the Krusie ship will be here too if you are uncomfortable with that.
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This story takes place after the events of the pacifist ending of Undertale, where all the monsters have already left the underground. However, that won't stop problems from starting again; Frisk and his friends will have to face a new threat. DISCLAIMER: This story is based on the fact that the first human fell underground in 2015 and the last in 2060. Here, Deltarune is a sequel to Undertale; therefore, Posttale is not a copy of TobyFox's creation, but an adaptation, or what is also called an "AU." Because of this, there will be things that are different from canon and adapted to my personal preference, with no intention of disrespecting anyone; for example, the gender of the humans: Kris: M Chara: F Frisk: M Don't like it? You can leave. Understood? Great. Contributors: @Fwrevy #Deltapad • Undertale and Deltarune are property of Toby Fox. • Images used in the story are property of their respective owners or made with AI. *#17 in the "Undertale" category 9/10/2026* *#3 in the "Deltarune" category 3/3/2026*

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