Deltarune x Undertale Fanfic: What are some interesting plot ideas?

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.

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 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.

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.

One interesting idea could be a fanfic that focuses on the backstories of the minor characters in Deltarune. For example, exploring what the lives of the Darkners were like before the events of the game.

Well, a cool concept in RWBY x Undertale fanfic could be the exploration of the different worlds. RWBY has its own complex world with Grimm, Huntsmen, and Kingdoms. Undertale has the Underground with its distinct areas and monsters. A fanfic could involve characters traveling between these two worlds and the culture shock they experience. Also, the magic systems in both could be merged in interesting ways. The Dust in RWBY and the magic in Undertale might interact in ways that create new powers or abilities for the characters.

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.

One idea could be that Alice finds herself in the Underground and has to navigate through the different areas using her unique sense of wonder. Maybe she befriends some of the monsters like Toriel and they go on an adventure together to find a way out for her.

One idea could be that the characters from Homestuck end up in the Underground of Undertale. They might have to deal with the various monsters there while also trying to find a way back home. Maybe John Egbert could team up with Frisk and they use their unique abilities to overcome challenges like puzzles and battles.

One idea could be that the animatronics from FNAF end up in the Undertale universe. They might be mistaken for strange monsters at first. The Sans character could be particularly intrigued by their mechanical nature and try to figure out how they work.