Well, in these fanfictions, Naruto's character changes in multiple ways. Firstly, his confidence gets a boost. Since Wood Release is such a rare and powerful ability, having it makes him feel more capable. However, he also becomes more responsible. He understands that with great power comes great responsibility. He has to protect the secret of his new power at times and also use it to protect his loved ones. This new power also makes him more respected among his peers, which in turn affects his relationships. He has to deal with envy from some and admiration from others, and this all shapes his character in a more complex way.
When Naruto gets the Dark Release in fanfictions, his character development is multi - faceted. At first, he may struggle with the moral implications of using such a power. This internal conflict shapes him into a more introspective character. As he masters the Dark Release, he becomes more confident in his abilities but also more cautious. He realizes that the power he wields can be dangerous if misused. His relationships with his friends may also change. Some friends might be wary of his new power, which forces Naruto to prove that he can still be the same Naruto they know and love, just with a new and powerful ability.
If Naruto got Ice Release, it would change the plot in many ways. For one, his battle strategies would be different. Instead of relying solely on his shadow clones and Rasengan, he could freeze opponents in place with Ice Release. In team battles, he could create ice barriers to protect his teammates. Also, it might change his relationships. Some characters who were initially uninterested in him might see him in a new light due to this unique power.
Naruto's character could develop a deeper understanding of the elemental chakra in a Storm Release fanfiction. Since Storm Release combines different elements, he would need to study and understand the nature of these elements more. This could lead to him becoming more of a chakra scholar, sharing his knowledge with others in the village. He might also become more patient as he has to take the time to master this complex power.
One great 'Naruto Gets Wood Release' fanfiction is 'The New Sage of Wood'. It shows Naruto learning to master the Wood Release in a really unique way. He has to overcome many challenges and the author does a good job of integrating the new power into Naruto's character development.
Naruto may become more confident. Having the Kyuubi body gives him a new level of power, which could boost his self - assurance in battles and in his interactions with others.
Naruto may become more calm and composed. Itachi's presence and training methods would likely instill a sense of discipline in Naruto. He'd probably be less impulsive in battles and think more before acting.
The power release can change the plot drastically. It might make the story move faster as Naruto can now overcome obstacles more easily. For example, if there was a powerful enemy that was previously a huge threat, Naruto's new power could make that enemy seem like a pushover.
His personality would be a mix of his old self and the influence of being a ghoul. He would still be the brave Naruto who wants to protect his friends and village. But at the same time, he'd have to constantly fight the more primal and aggressive instincts that come with being a ghoul. This internal struggle could make him seem moodier at times, as he tries to balance his two natures.
Naruto might become more cautious. With the great power of nuclear release, he'd know that one wrong move could cause massive destruction. So, he'd be less reckless in battles.
Naruto's character development would likely become more complex. With the Rinnegan and Sharingan, he would have access to a whole new level of power and knowledge. He might become more introspective as he tries to understand and control these powers. His relationships could also change. For example, his friends might view him differently, with a mix of awe and perhaps a bit of wariness due to the potentially overwhelming nature of these powers.