Undertail

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For an actual AU, see Under(her)tail.

Undertail
Created by Unknown Artist.
Author/s	Toby Fox
Date Published	September 22, 2015
Link/s	Subreddit
Type	Basic Change
Sub-Type	Theme Overhaul
Tone	Comedic
Medium	Animation Comic Written Story

Undertail is Undertale's R34 label, requested by Toby Fox to separate NSFW Undertale fanart from SFW Undertale art. Undertail, being the R34 label, means the characters can have varying levels of sexualization. The events are always complemented with adult and sexual themes.

Although having sexual themes, Undertail also focuses on a variable amount of couples in the stories that are made by fans. Sometimes the stories have crossovers between AUs.

Changes

Most of the Undertale and Undertale AU characters remain physically the same, but they may have the main personalities and behaviors changed, in order to look more sensual and appealing for the viewer.

• The skeletons may have a magic tongue, genitals, and tentacles.
• Mettaton may have artificial sexual parts.
• Napstablook may have genitals.
• Frisk and Chara may have both genitals (intersex).
• Frisk and Chara's age can also vary, being any of various ages (though, to avoid controversy, most of them were depicted as adults).
• Undyne's sex can be affected in both ways, but commonly being female.
• Flowey may or not have genitals.
• Temmie's appearance may change, having a teenage body or simply a normal body.
• Asriel's behavior may change depending of his forms. In his god-like form he can be more appealing and dominant, while in his child form he can be more shy and passive.

Trivia

• The Annoying Dog/Toby Fox is the least affected character in Undertail, while Sans is the most affected.
• The AUs most affected in the Undertail fandom are Underswap, Underlust and Underfell.