What are the common themes in gaster x reader fanfiction?

A sense of otherworldliness is common too. Since Gaster Sans is from a rather strange and unique universe, the fanfictions often play with the idea of the reader being in a very different, almost alien world. This can lead to themes of adjustment, as the reader tries to fit into this new world while being in a relationship with Gaster Sans.

One common theme is mystery. Gaster is often a mysterious character in the original source, and fanfics usually keep that element. They explore how the reader tries to understand Gaster.

One common theme could be the exploration of their relationship in the context of the outertale universe. It might involve how they interact with the unique settings and other characters in that AU.

One common theme is mystery. Since both Gaster and Sans have mysterious backstories in the original game, fanfictions often explore and expand on these mysteries, especially in relation to their relationship.

One common theme is loyalty. They are both important figures in the monster world, and stories often explore how loyal they are to each other and to their respective causes.

Power and knowledge are also common themes. Gaster is often depicted as having a great deal of knowledge, and his experiments might be related to power in some way. Fanfics explore how this knowledge and power can be both a blessing and a curse. They might also show how other characters react to Gaster's power and knowledge, whether it's with fear, envy, or admiration. In addition, some fanfics have a theme of redemption. Since Gaster's actions may have caused some chaos or harm, the fanfic could be about him trying to make amends in some way, either directly or through the actions of others he has influenced.

One popular 'gaster x reader fanfiction' is 'Gaster's Secret'. It has an interesting plot where the reader character stumbles upon Gaster's hidden experiments and a unique relationship develops between them. Another is 'In Gaster's World' which focuses more on the emotional connection between Gaster and the reader, set in a mysterious and slightly dark undertone world created by the author.

There's also 'Love in the Underground'. This fanfic stands out because it combines elements of mystery and romance. It shows how the reader might navigate the strange world of Underswap while getting closer to Gaster. It has a really engaging plot that keeps you hooked from start to finish.

A sense of belonging is another big theme. The reader, who may feel like an outsider in the real world, finds a place where they belong among the mutants. There are also themes related to fighting for justice, just like the X - Men do in the original stories.

One common theme is friendship - turned - love. Nagisa is often portrayed as initially being a good friend to the reader - character, and then their relationship develops into something more romantic over time. Another theme could be adventure, where they go on some sort of journey together.