The fanfiction could explore how Obito's identity revelation affects his relationship with the Akatsuki. Some members may feel used or deceived, while others might see it as an opportunity. It could also show how Obito's true self starts to form new bonds or break old ones within the organization, depending on how his true intentions are perceived.
Perhaps in the fanfiction, Obito's identity is revealed to be a double agent for a group that was thought to be extinct. This changes the way other characters view him and the overall power dynamics in the story. He could have been working towards a different goal than what was initially assumed.
Well, in an anime mashup novel, one key element is the blend of different anime universes. For example, characters from a shonen anime might interact with those from a magical girl anime. Another element is the plot which often has to be carefully crafted to make these different elements fit together. And the art style, even in written form, might be influenced by the distinct visual styles of the animes being mashed up.
Naruto could be one of his allies. Naruto has this knack for seeing the good in people and would probably be willing to give Obito a chance to redeem himself. Also, Sakura, with her skills as a medic - ninja, could be an ally. She might help heal Obito if he was injured during the war and see the potential in him to be a force for good.
One novel approach could be using machine learning algorithms to analyze the context and requirements of the mashup project and recommend relevant APIs based on that.
One way to create an interesting anime mashup novel is by focusing on the emotions of the characters. Let's say you mash up an anime about loss and another about hope. You can explore how the characters from the 'loss' anime deal with the more positive environment of the 'hope' anime and vice versa. Also, use the visual aspects of the animes in your descriptions. If one anime has a distinct color palette, incorporate that into your writing when describing the new, mashed - up world.
One possible motive could be to use Sakura as a bargaining chip. If he has some sort of plan against Naruto or the Hidden Leaf Village, Sakura, being a close comrade of Naruto, could be very useful. He might think that by restraining her, he can force Naruto to come to a certain location or make concessions.