However, in the realm of fanfiction, anything can happen. A writer could create an elaborate backstory where Naruto somehow ends up in the Blue Exorcist world and becomes Rin's father. Maybe there could be some sort of interdimensional travel or a really wild magic spell that links the two universes in a way that makes this relationship possible. But it would require a lot of creativity to make it believable within the context of the combined universes.
The story could also focus on the family dynamic. Naruto, being a very determined and positive character, could be a great father figure to Rin. He could encourage Rin to face his inner demons (both literally and figuratively) with the same kind of courage that Naruto has. And perhaps Naruto would have to protect Rin from the more dangerous aspects of the Blue Exorcist world using his ninja abilities.
Writers should first focus on his core traits. Rin is brave, so in any crossover, he should face challenges head - on. For example, if it's a crossover with a magical girl universe, he'd be the one jumping into danger to protect others. His loyalty to his friends and family is also important. In a crossover with a post - apocalyptic world, he'd do anything to keep his loved ones safe. Also, his hot - headedness should be there. If he's in a high - society crossover, he might get into arguments with the snobby characters because of his quick temper.
Naruto would probably be very surprised. He has heard about Rin from Obito and Kakashi. So when he actually meets her, he might be at a loss for words at first.
Sasuke would be furious. He already has a strong sense of justice and loyalty to Naruto. He'd likely immediately start looking for Naruto, using his Sharingan to track any possible leads. He might even go against the village rules if he thought the village was involved in Naruto's kidnapping.
Sakura might be really surprised at first. She could offer to help Naruto with his girl disguise, teaching him things like how to do his hair or choose the right clothes. She might also find it a bit funny but would be supportive in the end, seeing it as part of a mission. Sasuke, on the other hand, might be a bit more aloof. He would probably just raise an eyebrow at Naruto's new look but wouldn't make a big fuss about it as long as it was for a good reason.
His friends would be shocked at first. Sasuke might feel a sense of responsibility to find Naruto and bring him back. Sakura would probably feel guilty, especially if she was somehow involved in the situation that led to Naruto being cheated on.
There might also be a sense of self - doubt. Naruto may start to question his own judgment. He thought his friends were true to him, so the betrayal could make him wonder if he was wrong about them all along. He might also doubt his own worthiness as a friend and leader, which could have a long - term impact on his self - esteem.
Sakura would be worried sick. She might immediately inform Kakashi sensei and the rest of the village. Then, she would probably want to be part of the rescue mission. Sakura has grown stronger over time and would use her medical ninjutsu and combat skills to help save Naruto. She would also be constantly worried about Naruto's well - being and would encourage the others to move faster.
Sasuke might be initially cautious. He would observe Cell carefully to assess his threat level. He could offer his Sharingan - enhanced perception to help Naruto in the fight. Sakura, she would be worried about Naruto but also ready to jump in and heal any wounds. Shikamaru might be thinking of strategies in the background, trying to come up with a way to outwit Cell using his intelligence.