Lore/Character Design

The designs of the character are a very important and major component of UNDERFELL, debatably being the most notable feature; Fella mentions that originally, UNDERFELL was just an AU for making designs with a specific aesthetic, rather than having an actual storyline. It consistently follows a ruleset for both humans and monsters, though the monsters follow a much more extensive ruleset. The main/universal color is black, thus black is the primary color in outfits for both monsters and humans, regardless of involvement with Asgore or not.
== Monsters ==
For monsters, the secondary colors are red, gold, and purple. Only monsters directly involved with Asgore wear red and goldhttps://underfell.tumblr.com/post/184104801496/also-something-ive-wanted-to-say-for-years, with the exception of Sans. Otherwise, typically purple is paired with black instead. Of course, aside from color change, the monsters' physical appearance and clothing is edgier and more intimidating, most often having sharper details. This typically includes yellowed eyes and sharpened teeth, but the 'transformation' of these features happen over time as a monster becomes more traumatized, being "made that way" rather than having it since birth. A notable example is the skelebros, especially in Sans. 
==== Latex ====
Though appearing on several monsters, latex accessories are not common. Alphys is responsible for creating latex gloves and boots (all having various design differences), which is seen being worn by Papyrus, Undyne, and Mettaton. The latex is said to be of high quality and is typically a shade of red. Asgore is seen wearing what may be presumed to be black latex boots. Since Alphys creates the latex accessories, it is presumed only a select few people are allowed to have them, due to Alphys's apathetic nature to people not in her circle.
== Humans ==
Humans follow a much simpler ruleset, with the main change involving simply having more black to their current outfit, along with some minor clothing alteration. Chara is somewhat an exception, as they had borrowed Asriel's clothing when they were alive.
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