One common theme is friendship. Since Bendy and Cuphead are from different franchises, a lot of fanfiction focuses on how they become friends. For example, they might start off as rivals but then realize they have more in common than they thought.
A common theme is the clash of their different art styles. Cuphead has that rubber - hose, 1930s - style animation while Bendy is more of a creepy, old - timey cartoon look. Another theme is adventure. They often go on quests together in fanfictions.
One common theme is the struggle between good and evil. Since Cuphead as a vampire might have some dark tendencies, and Bendy could be on either side of the moral spectrum in different fictions. So, their relationship often explores how they deal with their own natures.
One common theme could be adventure. Since both Cuphead and Bendy come from rather action - packed worlds, it's likely that fanfics would involve them going on exciting adventures together, perhaps in a swapped universe as the 'swap' in the title might suggest.
One common theme could be conflict. Since Cuphead is evil in this, there would likely be a fight between him and Bendy over territory or power.
One common theme is friendship. Since Mugman and Cuphead are brothers, their relationship is often explored in terms of loyalty and support. Another theme is adventure, as they are always getting into some sort of trouble in the Inkwell Isles.
The theme of the power struggle often appears. The OC may have some special abilities that either put them at odds with Bendy or make them a valuable ally. Another frequent theme is the exploration of the unknown. The Bendy world is full of mysteries, and the OC is usually the one to start exploring and uncovering them. And of course, the theme of character growth, as both Bendy and the OC change and develop through their interactions.
One common theme is redemption. Henry often tries to redeem Bendy from his dark or villainous ways. Another theme is friendship. Despite their differences, they form a bond that is explored in many stories.
The theme of self - discovery also pops up. As they interact, both Bendy and Sans may learn new things about themselves. Maybe Sans discovers a more creative side through Bendy's influence, or Bendy becomes more confident in his abilities with Sans' support.
One of the common themes is definitely cooperation. Since they are both toon characters, they often have to work together to face challenges. There are also themes of self - discovery. As they interact with each other, they learn more about themselves. For example, Bendy might discover a more caring side of himself when he's with Oswald, and Oswald might find that he can be more daring with Bendy around. It makes for some really engaging stories.
Well, mystery is a big theme. Since Bendy comes from a rather spooky and unexplained world in the original concept, fanfictions often play on that. Also, the theme of trust. As the reader gets closer to Bendy, there's a development of trust between them. And there's also the theme of discovery, like the reader discovering new things about Bendy and his world.