Frisk could be one of the characters watching. Given their role in the game, they would be interested in Sans' fight as it could impact their journey through the Underground. Additionally, Undyne might be present. She's a strong fighter herself and would probably be sizing up Sans' techniques, maybe even learning from him or being critical of his fighting style depending on her mood.
It's not strange at all. Fanfiction is a creative exploration of the original work, and Deltarune might find it engaging to see how fans expand on the Undertale universe. It could be seen as a form of cultural exchange within the same fictional realm, and Deltarune might even learn something new about the Undertale characters or concepts from it.
Well, it could be really interesting. Deltarune might find the different interpretations in the fanfiction quite fascinating. It could see new takes on the characters it might be related to from Undertale. Maybe it would be inspired by the creativity of the fanfic writers.
One common theme is the exploration of the differences and similarities between the two worlds. Since Undertale and Deltarune have different settings and rules, fanfictions often play with how the characters react to these differences. Another theme is friendship. Characters from both games often form new friendships or strengthen existing ones across the world boundaries.
No. The Undertale community is mainly about positive things like friendship and hope. Abuse of any character, especially in a fanfiction, goes against the values of the community.
One interesting thing could be the different reactions of the characters. For example, some might be in awe of Sans' combat skills, while others could be worried about the outcome. They might cheer him on or try to interfere depending on their relationships with Sans.
One interesting concept could be the crossover of characters' personalities. For example, how the determination trait from Undertale might interact with the more mysterious elements in Deltarune. Another could be the exploration of different timelines. Since both games have some elements related to time and alternate realities, a fanfic might delve into how these timelines could cross or affect each other. Also, the unique magic systems of both could be combined in creative ways, like how the soul powers in Undertale might work with the magic in Deltarune.
One idea could be that the characters from Undertale find themselves in the world of Deltarune. For example, Frisk could end up in the Dark World and have to figure out how to get back home while interacting with the Deltarune characters. They might team up with Kris to fight against new threats that are a combination of both universes' villains.
Some characters might be amused. For example, Sans would probably make some witty remarks about the fanfiction's plot twists. Papyrus, on the other hand, might be a bit confused at first but then get really excited if he finds a heroic role for himself in the fanfiction.
There's 'Sans - Bound'. This fanfiction focuses on the challenges they face when they are forced to work together. It's not just about their relationship but also about the world - building in the undertale and underfell universes. The descriptions of the settings are vivid and add to the overall charm of the story.