Another possibility is a fused character. For example, if Dipper and Goku were to fuse using the Potara earrings or the Fusion Dance. This new character would have a combination of Dipper's intelligence and knowledge of Gravity Falls mysteries, along with Goku's combat prowess and ki powers. Such a fusion could potentially be the most powerful entity in the 'gravity falls dbz crossover fanfiction' as it combines the best of both worlds.
One interesting concept could be the characters from Gravity Falls getting Saiyan powers. For example, Dipper could discover he has latent Saiyan abilities and start training like Goku. This would change his dynamic in the Gravity Falls world as he tries to balance his newfound power with the mysteries of his hometown.
To create a compelling character interaction, think about the goals of the characters. In a crossover, a character from Gravity Falls might be trying to save their world, while a Reverse Falls character could be trying to take over the other world. When they meet, there will be conflict and negotiation. Let their different motives drive the conversation and actions. Also, use their unique abilities or powers in the interaction. If one can read minds and the other can manipulate shadows, how do those abilities play off each other when they interact? It can lead to really interesting scenes.
First, you need to understand the two universes well. Know the characters, their personalities, and the rules of their worlds. For Gravity Falls, know about the mysteries, the strange creatures, and the relationship between the characters. For MLP, understand the magic, the different pony types, and the importance of friendship. Then, come up with an interesting concept for the crossover. It could be a simple visit between the two worlds or a more complex situation like a shared threat that forces them to work together.
It's likely to be Goku. His ability to constantly increase his power level through training and reaching new forms like Super Saiyan God and Ultra Instinct gives him an edge. He could potentially overpower most of the Bleach characters.
Another candidate could be Ruby with the Silver Eyes. If her power could be enhanced with DBZ - like Ki training, she might become the most powerful. But then there are also characters like Beerus who could potentially wipe out entire planets in both universes. So it's really a complex comparison.
It's really hard to say. Goku has the ability to reach extremely high power levels and transform into powerful forms like Super Saiyan God. However, Naruto has the Nine - Tails' chakra and the power of the Sage of Six Paths. If they were to combine their powers, they would be extremely formidable. But if we had to choose just one, it might be Goku in his Ultra Instinct form as his speed and power seem almost limitless compared to what we've seen in the Naruto universe so far.
Vegeta in his Ultra Ego form also has a claim to being one of the most powerful. He can absorb and use attacks against his enemies. However, in the Marvel side, characters like Sentry with his near - limitless power could also be a contender. In a crossover, it would be about who can adapt better to the other's fighting style and power system.
Another common theme is friendship. The main characters in both shows are young and form strong bonds with their friends. In crossover fanfiction, you'll often see the characters from Hilda befriending the characters from Gravity Falls. They might rely on each other's unique skills and knowledge to get through various challenges, like when Hilda uses her wilderness skills and Dipper uses his mystery - solving abilities to face a common threat.
Mystery is also a big theme. Both Naruto and Gravity Falls have elements of mystery in their own right. In the crossovers, these mysteries blend. For instance, the mystery of the Akatsuki's goals in Naruto might get intertwined with the mystery of the Gravity Falls anomalies. And of course, there's the theme of self - discovery. The characters, whether from Naruto or Gravity Falls, learn more about themselves as they interact with the new and different characters from the other universe.
Another idea is a crossover of the Upside Down and the Weirdness of Gravity Falls. Imagine Eleven using her powers in Gravity Falls and discovering new and strange things about the town. The kids might explore areas where the laws of physics seem to be a mix of both their worlds. For example, they could find a portal that leads to a place that has elements of both Hawkins and Gravity Falls.