Sans is often a very popular character in Underverse fanfiction. His unique design and mysterious personality make him a favorite for many fans to write about.
One interesting storyline could be the exploration of alternate universes within the Underverse setting. Characters might discover new powers or forms in these different realms.
One of the main themes is self - discovery. Since the Underverse is such a strange and different world, the reader usually learns a lot about themselves during their experiences there. Also, there's the theme of survival. The Underverse can be a dangerous place, and the reader has to figure out how to stay alive. There are also some fanfics that have a theme of redemption, where a character in the Underverse is given a chance to change for the better with the help of the reader.
Sure. 'Underverse x Reader' fanfics can often be found on popular fanfiction websites like Archive of Our Own. Some good ones might focus on unique relationships between the reader and the Underverse characters, like a story where the reader has to team up with Cross to survive in a dangerous situation in the Underverse.
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