What could be an interesting plot for an Undertale and Spider - Man crossover fanfiction?

Well, perhaps Bowser somehow makes a deal with some of the more malevolent characters in the Undertale world, like Flowey. Then Mario has to not only deal with Bowser but also the new threats from the Undertale realm. He might have to learn about the concept of LOVE and EXP in the Undertale world to fully understand how to defeat his enemies. And along the way, he could meet Sans and Papyrus, and they could have some really funny exchanges due to their very different personalities.

One possible plot could be that Naruto, while on a mission, somehow gets transported to the world of Undertale. He teams up with Frisk to stop Flowey from taking over both their worlds. Naruto's ninja skills, like his shadow clones, could be used in creative ways in the battles against the monsters in Undertale.

One interesting plot could be that the main character from DDLC, say, the protagonist, gets transported into the Undertale universe. They could start in the Ruins and interact with Toriel. Since the DDLC character is used to a different kind of world, their reactions to the monsters and the unique magic in Undertale would be fun to explore. Maybe they could try to use their knowledge from DDLC to solve some of the problems in Undertale, like trying to understand the nature of EXP and LOVE in the context of their own experiences.

One possible plot could be that Doctor Doom teams up with some of Spider - Man's villains like Green Goblin. The Fantastic Four and Spider - Man have to put aside their differences and work together. Spider - Man's agility and quick thinking combined with the Fantastic Four's unique powers would make for some great action scenes. For example, Spider - Man could swing in and save Sue Storm when she's in trouble, and in return, the Human Torch could help Spider - Man by burning away some of the webs that his enemies have trapped him in.

One possible plot could be that they team up to stop a powerful villain who has the ability to travel between their two cities. Maybe this villain is stealing tech from Gotham and super - powers from New York. They start off not trusting each other as they have different methods. Nightwing is more stealthy and trained in combat, while Spider - Man is more quippy and uses his webs in a very acrobatic way. But as they face challenges together, they learn to work as a team and combine their skills to take down the bad guy.

One possible plot could be that Spider - Man gets transported to the RWBY universe. He might initially be confused by the Grimm and the Huntsmen and Huntresses. Maybe he teams up with Team RWBY to fight a new type of threat that combines the technology - based villains from his world and the Grimm from RWBY. For example, a villain could be using some sort of Dust - powered tech to create super - Grimm. Spider - Man's agility and web - slinging abilities would be a great addition to the RWBY team's combat styles.

If it's a crossover with the Fantastic Four, perhaps a cosmic entity is attacking Earth. Spider Man teams up with them to stop it. But during the battle, he's exposed to some deadly radiation from the entity. Despite the Fantastic Four's efforts to save him, his body can't withstand it, and he dies. His death could lead to the Fantastic Four creating new safety protocols for future battles.

One possible plot could be that Spider - Man and Wonder Woman team up to stop a powerful villain who has the ability to manipulate time. Spider - Man's agility and quick thinking combined with Wonder Woman's strength and magical weapons would make for an exciting adventure. They might start off not trusting each other fully, but as they face challenges together, they learn to work as a team.

One possible plot could be that Spider - Man gets accidentally transported to the Avengers' headquarters. He has to prove himself to the Avengers at first, since they don't really know him well. Then, they discover a common enemy that is planning to attack both New York City (Spider - Man's territory) and other major cities around the world that the Avengers protect. Together, they combine their powers and skills. Spider - Man's agility and spider - sense work well with Iron Man's technology, Captain America's leadership and combat skills, Thor's godly strength, etc. They have to overcome their differences in fighting styles and strategies to defeat the enemy.

One possible plot could be that Naruto is somehow transported to the Spider - Man universe. Maybe he lands in New York and is mistaken for a new kind of super - powered being. Spider - Man, being curious, approaches him. Naruto, not understanding this new world, starts using his ninja skills which amaze the people around. They then team up to fight a common enemy like the Green Goblin who has somehow got hold of some chakra - based technology. The combination of Naruto's ninjutsu and Spider - Man's web - slinging and super strength would make for an epic battle.