Perhaps the most exciting plot twist is that the summoning scroll is a portal to another dimension. This other dimension could be a place where the rules of the Naruto world don't apply in the same way. The characters would have to adapt quickly and learn new skills to survive there. And when they come back to their own world, they bring back with them new powers and knowledge that shakes up the existing power balance.
Naruto himself is often a very popular character in these fanfictions. Since he's the main character of the original series, fans like to see him interact with the summoning scroll in different ways, like unlocking new summoning abilities or having some special bond with the creatures he summons.
Well, it could be about a ninja who is not very good at normal ninjutsu but then stumbles upon the master summoning scroll. The fanfiction might tell how this character uses the scroll to summon unique and unexpected things. For example, instead of just summoning animals like in the original Naruto, they could summon mythical beings from ancient legends that no one has ever seen before. This would give the character an edge in battles and also lead to all sorts of adventures.
A really exciting plot twist can be when Agunimon turns out to be related to some ancient power in the Naruto world. For example, it could be linked to a long - lost clan's forbidden jutsu. This revelation then leads to a whole new set of challenges and adventures as Naruto and Agunimon have to deal with the implications. The story then delves into exploring this new connection, uncovering secrets about the Naruto world that were previously unknown.
It could be a young and inexperienced ninja who discovers the master summoning scroll by accident. This character would then grow in power and skill as they learn to use the scroll.
One of the most exciting plot twists could be the return of a long - thought - dead character with new powers. Maybe a villain from the past comes back stronger and with a different motive, like Orochimaru returning with a new form of immortality technique. Another could be Naruto suddenly losing his powers and having to find a new way to fight, which would completely change the dynamics of the story.
One exciting plot twist could be a character from the Naruto universe who travels back in time to the Jedi universe and discovers they are actually a long - lost Jedi descendant. This completely changes their understanding of their own powers and heritage.
One exciting plot twist could be that Naruto discovers a new, ancient form of chakra that no one has ever seen before. This new chakra gives him powers far beyond what he already has, allowing him to defeat enemies with ease. Another could be that all the tailed beasts suddenly merge with Naruto, not just the Nine - Tails. This would make him an incredibly powerful force in the ninja world.
Perhaps a major plot twist could be that the tailed beasts in Naruto are somehow connected to the Mother Boxes in the Justice League world. When the Mother Boxes start acting up, it's because the tailed beasts are influencing them. This would force the Justice League and Naruto's friends to work together to figure out how to stop the chaos. Another plot twist could be that the Justice League members are transported to the Naruto world and have to adapt to the ninja way of life, and in the process, they discover new powers within themselves. And finally, if Naruto was able to summon a Justice League member as a summon, like if he could summon Superman instead of a toad, that would be a wild and unexpected plot twist.
A really cool plot twist could be that the Rinnegan in Naruto is not a normal one. It has a hidden power that was sealed away by the Sage of Six Paths long ago. As Naruto unlocks this power, he realizes it's linked to a prophecy that he initially didn't understand, and it changes his whole perception of his role in the ninja world. This would involve a lot of self - discovery and new challenges for Naruto.
One exciting plot twist could be Kin being secretly allied with Orochimaru during the Chunin Exams. Instead of just being a Sound Ninja, she has her own motives related to Orochimaru's plans for Sasuke. This would add a whole new layer of mystery and danger to the story.