Mature Works

From Undertale Fanfic Recommendations

So most recommendations on this wiki assume a rating no higher than Teen/PG-13/15. In this section goes everything that is M/R/18 rated, be it word, image or video. There are two broad categories. Mature Fics cover graphic violence, heavy swearing, and general unpleasantness. Lewd Fics are mostly rooted in sex. There isn't an exact science as when Mature becomes Lewd, and it's easy to see a bit of both.

Mature Works

Name Tend to Your Memories
Author(s) Rainbow_Sprinkles
Works 3
Word Count 210,000
Synopsis When a psychologist is the first human to encounter Frisk and the Monsters after the barrier breaks, she befriends and advises them as they begin to build their new life and cope with the challenges involved.
Main Character(s) Isla (OC), Sans, Everybody eventually gets a moment in the spotlight
Other Tags Pacifist Ending, Sans/OC Romance, References to Abuse, Swearing, Trauma, Violence
Recommendations

Fics that revolve around OCs, an OC that hooks up with Sans no less, are usually a red flag for me. But Isla is pretty well realised, and the Romance is not front and center. What is are the dual prongs of the logistics of monsters integrating with humanity, and Isla exploring their assorted baggage. Few of the main cast go unexamined. And in spite of their baggage, the groundwork is laid for them to recover and even be happy. If there's a weak point, the anti-monster racism is pretty shallow and shallowly addressed, and it escalates in a borderline edgy fashion, but fortunately that's not a deal breaker.

-O'Nonymous

Name Ebott's Wake
Author(s) TimeCloneMike
Word Count 592,000 (Ongoing)
Synopsis The adventures of the Monsters on the surface as they move to the small town of Ebott's Wake and deal with new trials and tribulations.
Main Character(s) The Main Undertale Cast, Lots of OCs
Other Tags Post-Pacifist Ending, Swearing, Violence
Recommendations
Name The Best of Times, the Worst of Times
Author(s) ABadTime
Word Count 117,000
Synopsis Set immediately after the True Pacifist ending, something instantly goes wrong with Sans when he breaks down and disappears in a blaze of blue light! When the others investigate, his dark history rears its ugly head...
Main Character(s) Sans, Papyrus, Frisk, Gaster, Alphys, Undyne, Toriel
Other Tags Post-Pacifist Ending, Gasterblaster AU, Body Horror, Violence
Recommendations It's the pioneer Gasterblaster AU fic. What else can I say? It explores the reason behind Sans' abilities quite uniquely, as well as create one of the coolest designs for an AU Sans (or Undertale characters in general)! - Curry

Lewd Works

Name The Garden (Chapter 10.5)
Author(s) Doogly_writes
Word Count 3,200
Synopsis Between chapters ten and eleven of The Garden, Asgore and Toriel celebrate their reunion with sexy times.
Main Character(s) Asgore, Toriel
Other Tags Pacifist Ending, Asgore/Toriel Romance, Sex
Recommendations