Well, sometimes in fanfiction, Naruto changes his attitude when he discovers a new power within himself. Realizing that this power comes with great responsibility, he could become more solemn and focused. He might start to view his friends and enemies in a different light, perhaps seeing the potential for good in his foes and being more cautious about involving his friends in dangerous situations.
In some fanfictions, Naruto might change his attitude due to a major event. For example, if he fails to protect a dear friend, he could become more serious and less impulsive. This new attitude would be a result of the guilt and the realization of his own limitations.
Perhaps he would change to Naruto Storm. 'Storm' can represent his powerful and sometimes tempestuous nature. In the series, Naruto has shown great strength and determination that could be likened to a storm, which is both destructive and at the same time a force of change.
One common reason is love. If Naruto falls in love in a fanfiction, he may become more gentle and considerate, changing his usually rambunctious attitude. His focus could shift from just being the best ninja to also taking care of the person he loves.
His character would become more secretive. Instead of being the open - hearted Naruto we know, he'd have to keep things to himself. For instance, he couldn't share all his thoughts and experiences with his friends right away.
The appearance of a new and powerful enemy can also change Naruto's attitude. If this enemy is far stronger than any he has faced before and uses tactics that are completely unexpected, Naruto may realize that his old ways of fighting and thinking won't work. So he could become more cautious and start to study his opponents more carefully.
His confidence could turn into over - confidence bordering on arrogance. As a villain, he might think he is above everyone else and that his way is the only right way. He would no longer listen to advice or consider the consequences of his actions on others, believing that he can handle any situation on his own, no matter how dangerous or unethical.
Clothing changes can also represent his emotional state. If he's wearing something more somber and dark, it might indicate a period of self - reflection or dealing with a difficult situation. For example, after a major battle where he loses a friend, he could change into all - black clothes as a sign of mourning.
One possible Naruto fanfiction with Tobirama's attitude could be where Naruto, in a strange turn of events, starts to exhibit the same no - nonsense and strict attitude as Tobirama. For example, he might become more firm in his leadership within Team 7. Instead of his usual go - with - the - flow style, he would demand more discipline from Sasuke and Sakura, much like Tobirama would have expected from his subordinates.
In a Naruto fanfiction where he has Madara's attitude, he could become more power - hungry. Madara was always seeking power to reshape the world according to his ideals. Naruto might start to view the tailed beasts not as friends but as tools for greater power. He could try to gather more chakra and perhaps even attempt to unlock new forms of power that are more in line with Madara's dark and ambitious nature, which would shock his comrades and enemies alike.