One idea could be that the characters from Undertale find themselves in the Deltarune world and have to adapt to its different rules and characters. For example, Sans could meet Ralsei and they could have a humorous exchange about the nature of their respective universes.
Maybe in the fanfiction, the Dark Fountains from Deltarune start appearing in the Undertale world. This causes chaos as the monsters in Undertale don't understand what these strange fountains are. Frisk, along with the Deltarune trio, has to figure out how to stop the fountains from spreading darkness. They could learn from each other's powers and strategies. For example, Frisk could teach Kris about determination in a more in - depth way, and Kris could show Frisk how to navigate the strange new areas created by the Dark Fountains.
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.
Definitely Sans and Jevil. Sans' laid - back yet perceptive nature combined with Jevil's chaotic and unpredictable personality would make for some really interesting exchanges. Sans might try to understand Jevil's view of the world, which is so different from his own in Undertale.
Susie and Undyne would be a great pair. Susie is the tough - looking monster from Deltarune, and Undyne is the powerful fish - like monster in Undertale. They could have an epic battle at first, but then realize they have a lot in common. They both have a strong sense of justice and a love for fighting. After their initial clash, they could team up to fight a greater evil, perhaps something that threatens both Deltarune and Undertale. They could exchange fighting techniques and learn from each other's strengths.
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.
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.
Well, 'The Bridge Between Worlds' is a really good 'undertale x deltarune fanfiction'. It delves into the idea of building a bridge, not just literally but also metaphorically, between the two worlds. The characters from both sides start to understand each other's cultures and powers. There are some really cool fight scenes where the unique abilities from both Undertale and Deltarune are combined in creative ways.
Sans is another great choice. His laid - back but extremely powerful nature in Undertale would create a lot of interesting dynamics in a Deltarune world. He could befriend or baffle the Deltarune characters. For example, his time - related abilities would be very different from anything in Deltarune, and it would be fascinating to see how he uses them in a crossover situation, like against the Darkners.