If Naruto had Tobi's personality, he might become more mysterious. He could start playing pranks on his friends in a more devious way, like Tobi does. His interactions with Sasuke would be really interesting. Instead of being so straightforward, he'd be more likely to toy with Sasuke, which would completely change the dynamic of their relationship.
One way is to tie his alternate personality to a hidden power or a unique kekkei genkai. Maybe this hidden part of him has abilities that no one suspects. This can lead to him being a more complex and unpredictable character in the fanfiction. As he discovers and learns to control this aspect of himself, it can drive the plot forward, especially if other characters start to notice the changes in him.
In some fanfictions, Tobi's alternate personality might be related to a hidden past or a connection to a long - lost shinobi clan. This could lead to a whole new backstory for the character and add depth to his motives in the Naruto universe.
His goal of becoming Hokage might take a different turn. Instead of being the hero that everyone looks up to, he could be a more shadowy figure. He might use his influence as Hokage in a more manipulative way, like Tobi uses his power. So his idea of what it means to be Hokage could be completely warped.
Well, Naruto might gain some new powers or knowledge from having Tobi sealed. Maybe he could access Tobi's memories and use that information to prevent future threats.
The story in this fanfiction might progress as Naruto discovers new things about Tobi's past while he is sealed. This could lead to revelations about the overall plot of the Naruto world. As Naruto delves deeper into Tobi's secrets, he may also face opposition from those who fear the power he now holds with Tobi sealed within him. His relationships with his friends and allies could be tested as they try to decide whether to trust Naruto or not with this new power.
Yes, there are quite a few. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for 'naruto is tobi' and you'll find a variety of stories with different plotlines and interpretations.
Common themes include the idea of changing the course of the Naruto story. With Naruto being related to Tobi in some way in these fanfictions, it can lead to different outcomes for the ninja world. For example, they could team up against a greater threat that wasn't in the original plot. There's also the theme of uncovering secrets, as Tobi has many secrets, and Naruto could be the key to revealing them all.
He could be portrayed through his appearance. For instance, one personality might have different - colored eyes or a distinct style of dressing. His behavior would also change. When in one personality, he could be very talkative and energetic, and when in the other, he could be silent and brooding.
Well, he might start being more mysterious like Tobi. He could start using more deception in his actions, for example, hiding his true intentions from his friends just as Tobi often did. Maybe he'll also start using some of Tobi's speech patterns or ways of interacting with others in a more indirect and puzzling way.