A third theme could be growth. They both start from certain points in their characters and develop over the course of the fanfic. Tobi might become more serious or Zetsu might open up more, depending on the plot and how the author wants to develop their relationship.
One main theme is loyalty. Given their relationship in the Naruto series, fanfictions often explore how loyal they are to each other and their common goals.
I'm not sure specifically about 'Tobi x Zetsu' yaoi fanfiction. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. They usually have a wide variety of fanfictions, and you might be able to find some related to this pairing there.
One popular tobi x zetsu fanfiction is 'The Bond of Shadows'. It delves into their unique relationship and the adventures they might have together in the Naruto universe.
There's also 'Tobi and Zetsu: A Different Perspective'. This fanfic delves deep into their backstories and how those past experiences might influence their relationship. It's really interesting as it gives a fresh take on their characters and how they could have come to be the way they are in the Naruto universe.
FanFiction.net could also be a source. Just be aware that the tagging system might not be as detailed as AO3. You'll need to dig a bit deeper by using different search terms related to the characters and the yaoi genre. Additionally, some fan - made forums dedicated to the relevant fandom might have links or discussions about such fanfictions.
Well, one way could be in their physical abilities. Maybe in the fanfic, Naruto is shown to have some of Zetsu's stealthy movement skills, like being able to blend into the environment in a similar way. Another similarity could be in their connection to nature. Zetsu has a strong link to the plant - like aspects of nature, and Naruto's chakra might be shown to have a similar kind of connection in the fanfic.
Yes, there might be such fanfictions out there. Fanfiction writers often come up with creative and unique concepts like this. They might explore how Harry's new identity as the reincarnation of Tobi would change the story, his relationships, and his powers. It could lead to a whole new set of adventures and interactions within the fan - created universe.
Fanfiction should be a creative and positive space. 'Naruto tobi pedo fanfic' involves inappropriate and immoral themes. In the Naruto fandom, there are so many positive aspects like the story of friendship, growth, and ninja adventures that can be explored in fanfic, rather than this kind of disturbing content.
I'm not sure specifically as there could be many different interpretations in fanfiction. But it might involve Zetsu using his unique abilities to rescue Naruto from a dangerous situation, like a powerful enemy attack or a life - threatening trap.