In some fanfictions, an interesting plot development is that Naruto's control over all elements attracts the attention of ancient and powerful beings. These beings either want to test his power or use it for their own purposes. He may also have to face off against other characters who have also somehow gained the ability to control multiple elements due to his influence. This could lead to intense rivalries and battles as they compete to prove who is the master of the elements. Also, Naruto might use his all - element control to explore long - lost ninja lands or ruins that were sealed by powerful elemental barriers.
Well, a cool plot development might be that Naruto uses his ability to control all elements to bring peace to the ninja world in a unique way. He could use earth to rebuild damaged villages, water to provide clean water sources, fire to provide warmth in cold areas, and wind to power mills or something like that. Also, there could be a plot where he has to train a new generation of ninjas in his all - element control techniques, which leads to a whole new set of adventures.
One interesting application is his ability to create entirely new jutsus by combining different elements. For instance, he could mix fire and wind to create a super - heated blast that's more powerful than either element alone.
One interesting plot development could be Izuku using his new control over One for All to quickly master new quirks within it. He might surprise his classmates and teachers with his rapid progress in combat training.
One interesting plot development could be Naruto using his time - control ability to prevent the death of his parents. He might go back in time and change the events that led to their demise, thus altering the whole Naruto universe as we know it.
One interesting plot development could be Naruto having to deal with the Uchiha clan's history and secrets that come with the Sharingan. He might have to face the Curse of Hatred that the Uchiha are known for. Another aspect could be his relationship with Sasuke changing. Since Naruto now has a part of what makes Sasuke special, it could create a new dynamic between them, either one of rivalry or cooperation in a different way.
One interesting plot development could be Naruto's unique fighting style integrating with the peerage's combat strategies. His shadow clone jutsu, for example, could be used in new and creative ways during battles against other supernatural groups. It might also lead to some comical moments as Naruto tries to adjust to the more formal and sometimes strict rules within Rias' peerage.
Perhaps Naruto uses Kushina's memories to better understand the political landscape of the village in the past. This knowledge could help him to navigate current political issues in the village more effectively. He could use the wisdom from her memories to make changes or prevent past mistakes from repeating, which would be a very engaging plot development.
One interesting plot development could be that Naruto has to find alternative ways to communicate his thoughts and feelings. For example, he might use sign language or write notes. This would change the dynamics of his relationships as his friends would have to learn to understand him in a new way.
One possible plot development could be that Naruto uses his new - found control of the Nine - Tails to defeat a powerful enemy that was previously unbeatable. He might be able to combine his own ninja skills with the Nine - Tails' power in a more efficient way, like creating new and unique jutsu.
One interesting plot development could be the new relationships that form between characters. For example, Naruto and Hinata might face new challenges as a married couple in the post - last story world. Another could be the growth of their children, like how Boruto and his siblings adapt to their parents' legacies.
Another aspect could be that Naruto's baby form has some unique abilities or auras. Maybe his presence as a baby has a calming effect on some of the more aggressive characters in the Naruto world. His friends could also discover new things about his past or his family through his baby state, like finding a hidden mark on his body that gives clues about his heritage.