He may start to distance himself from his friends. Instead of being the overly friendly Naruto, he becomes more reserved. For example, he might not be as quick to join in on group activities or conversations.
His appearance might also change to reflect his new cold attitude. He could start dressing in darker colors or have a more serious look on his face all the time. His body language would be less open and more defensive, like crossing his arms more often and avoiding eye contact.
Naruto would become more perceptive. The Sharingan gives the ability to see chakra flow and predict movements. So, he'd be better at combat, and his confidence would likely increase. He might start to rely more on his new visual powers rather than just his raw strength and Nine - Tails chakra.
In some fanfictions, Naruto becomes more confident after the Wave Mission. He realizes his own strength and the importance of his friends more deeply. For example, he might be more assertive in battles and decision - making.
Well, in certain fanfictions, Naruto's view of the ninja world as a whole can shift after the Wave arc. He might start to question the traditional ninja values. Since he witnessed the greed and corruption that led to the problems in Wave, he could strive to change the ninja world from within. He may begin to form his own ideas about what it truly means to be a ninja, which could be different from what he was taught at the academy. He could try to promote peace and cooperation more actively, rather than just following orders blindly.
In some fanfictions, Sakura might become more confident after the Wave mission. She realizes the harshness of the ninja world and starts to train harder, not just relying on her teammates. For example, she could be seen spending more time in the hospital, learning advanced medical ninjutsu to be more useful in future battles.
Naruto becomes more determined. With Jiraiya's death, he realizes that he has to grow up faster and become stronger. So, his focus on training intensifies, and he's more eager to master new techniques.
Well, Naruto being the daimyo could bring a lot of positive changes. He might start by reforming the military system. Since he has his own ninja skills and experiences, he could train the local forces better. Also, he'd probably focus on improving the economy. For example, he could use his influence to get more trade deals with other countries. And in terms of society, he'd promote equality among all the people in Wave Country, regardless of their social status or origin.
It makes him more complex. Instead of just having his Uzumaki heritage, he now has to deal with the traits and expectations of the Senju and Uchiha. He might become more introspective as he tries to understand the differences and similarities between the three lineages.
Well, being the jinchuriki of Saiken would likely make Naruto more in tune with water - based chakra. He might become more adaptable and fluid in his fighting style. His character could also grow to be more empathetic towards other jinchurikis and their struggles, as he now shares a similar burden. This new status might also lead to new friendships or alliances with those who have an affinity for Saiken's power.
If Naruto is the son of Kyuubi in the fanfiction, his character development would be drastically different. He would have a different kind of self - discovery journey. His relationship with the villagers could be more hostile from the start. They might not just see him as the container of the Kyuubi but as the actual offspring of the beast they fear. This would force him to grow up faster, in a sense. He would have to prove himself not just as a ninja but as someone worthy of acceptance despite his 'parentage'. His training might also focus more on controlling his in - born Kyuubi - like traits rather than just taming the Kyuubi's power within him.
It would likely make Naruto more philosophical. As the reincarnation of a god, he might start to question the nature of power, destiny, and the world around him. This could lead to him having deeper conversations with his friends and mentors, and ultimately change his view of the ninja world and his place in it. For example, he might start to think about how to use his power not just for the sake of his village, but for the greater good of the entire world, which would be a huge shift in his character development.