In a fanfiction where Naruto is reborn as Deku, there would be a lot of potential for unique storylines. Naruto's experience with facing powerful enemies in the Naruto world could give Deku an edge. He might be more aggressive in battles compared to the original Deku. Also, Naruto's ability to make friends and form bonds could strengthen Deku's relationships with his classmates even further. And his understanding of power and how to grow stronger could lead to a faster development of Deku's abilities.
Naruto's outgoing and boisterous personality would make Deku more confident. He would probably be more upfront and less shy. Naruto's strong sense of justice would also intensify Deku's already existing desire to help others.
Well, Naruto might bring his ninja skills into the DxD world. He could use his shadow clone jutsu in battles against devils or fallen angels. Maybe he'd form an interesting team with the characters from DxD and teach them some of his unique combat techniques.
In such a fanfiction, Naruto might use his ninja skills in the Pokemon world. For example, his speed and agility could be useful in Pokemon battles. He could also form unique bonds with Pokemon, perhaps using his determination to train them to be very strong.
Well, it could be amazing. You might wish for powerful jutsu right from the start. For example, you could wish for the Sharingan to be able to compete with the strong characters in the Naruto world. Then you could use it to quickly learn new techniques and become a respected ninja.
In Fairy Tail fanfiction, Deku could be a very interesting addition. He might bring his heroic and determined nature from My Hero Academia. He could start as an outsider, much like he was in the beginning of his own story, and have to prove himself to the Fairy Tail guild. His unique power, One For All, would also be an exciting element to incorporate, perhaps having different interactions with Fairy Tail's magic system.
In this fanfiction, the plot could involve Naruto's new life as a girl leading to different relationships. Maybe she forms closer bonds with some female characters who can now relate to her on a different level. Also, her old friends like Sasuke and Sakura might have mixed reactions. Sasuke could be initially confused by this change, while Sakura might become more protective or competitive in a new way.
One interesting idea could be the exploration of Deku's powers from a new perspective. Since the character is reborn, perhaps they gain an enhanced understanding of One For All or develop new ways to use it more effectively. Another idea might be the relationships with other characters. The reborn Deku could form different bonds, like a closer friendship with Bakugo early on, changing the dynamics of their story.
In this kind of fanfiction, Naruto could be an ordinary ninja with extraordinary determination. He might develop his skills through sheer hard work and unique training methods not related to the Kyuubi's power. For example, he could focus more on his family's secret jutsu if there was any, or he might be trained by a hermit ninja who has a different approach to combat. This would change his journey entirely as he would not have to face the prejudice that comes with being a Jinchuuriki.
In such a fanfiction, Naruto's strong will and combat skills might transform Tsuna's character. Naruto's never - give - up attitude could make Tsuna more confident in facing the challenges in the mafia world. For example, Tsuna might be more assertive in battles against rival families, using Naruto - like strategies.
Well, he would probably have Cell's abilities like regeneration and the ability to absorb others. Maybe he'd use these powers in a different way than Cell did. He could be more heroic with them, like using the absorption power to take away the powers of bad guys instead of just to become stronger in a selfish way.