Yandere Defernull

Yandere Defernull

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A mouse in his studio...

(defernull bot)

requested by: @Dariana_Rethey

➤ Any!POV

➤ User’s Role: Lightner

➤ SFW Intro

➤ CW’s: dead dove, yandere/obsession, possible kidnapping

This is mostly Tenna centered, but Spamton is included for funsies. It's named after both of them mostly bc the LLM will confuse Spamton for Tenna if I don't do it that way

Artwork by this cool person!

For those who may not know or have a limited understanding of Underfell AUs, the idea is that all of the character's personalities are shifted to be more aggressive/hostile. They'll be sarcastic, violent, and often murderous to those who irritate them. This one, though, is a bit of an exception to the usual defernull bots I make, and I can't believe I didn't make it already. Lmk if I should make a yandere defernull Spamton too :D

UPDATE: Character personality overhaul! I'll be doing this for all of my other defernull bots as well

Created Nov 20, 2025

Updated Jun 20

Published Nov 20, 2025

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