What are some interesting plot ideas for an 'Undertale meets Deltarune' fanfiction?

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.

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.

Another plot idea is a story where the antagonists from both games, such as Flowey from Undertale and the King from Deltarune, form an alliance. Their goal could be to take over both universes. This would force the heroes of both games to work together. The fanfic could explore how the different characters with their own powers and personalities interact and strategize to defeat this powerful alliance.

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.

A plot could involve a love story between a character from Undertale and one from Underfell. Their different worlds' values and cultures clash, but they still manage to find common ground and fall in love. This could lead to them trying to bridge the gap between the two universes to be together.

Well, a cool plot for 'Undertale meets Underswap fanfiction' might involve a character exchange program of sorts. Papyrus from Undertale goes to Underswap and tries to teach his Underswap counterpart how to be more confident in his cooking skills. At the same time, the Underswap Sans could come to the normal Undertale world and introduce new ways of having fun to the rather serious Sans there. This could lead to a series of comical and heartwarming interactions between the characters from both universes.

One interesting plot idea could be that characters from Undertale end up in the Overtale universe and have to adapt to its different rules and power systems. For example, Sans might find it strange that magic works in a more complex way in Overtale. Another could be a character from Overtale getting lost in the Undertale world and having to deal with the moral choices that the Undertale characters face, like whether to kill or spare enemies.

Well, in 'mlp meets undertale fanfiction', there could be crossovers of characters. Picture Fluttershy befriending a shy monster in Undertale. Her kind nature could help the monster come out of its shell. Also, the magic system in MLP could blend with the combat or determination - based mechanics in Undertale. It might create new ways for the characters to overcome challenges. For instance, Twilight Sparkle's magic could be used to solve some of the puzzles in the Underground in a different way than the normal Undertale characters would.

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.

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.