One possible scenario could be that Sasuke returns just in time to see Sarada's skills in the Chunin exam. He might be filled with pride as he watches her fight. Sarada, on the other hand, would be motivated to show her father what she has learned. It could also be a moment of emotional reunion, especially if they haven't seen each other for a while.
One possible plot could be Naruto facing unique challenges during the Chunin Exams that are different from the canon. Maybe he has to deal with a new type of opponent, like a ninja from a far - off land with strange and powerful jutsu. This would test his skills and growth as a ninja in new ways.
After meeting in the Chunin exam, their relationship could become stronger. Sarada might start to train more rigorously with Sasuke, eager to learn from him. Sasuke could become more involved in her life, guiding her not just in ninja skills but also in understanding the ninja world better.
On a broader scale, Naruto's achievement as a Chunin could affect the relationships between the Hidden Leaf and other ninja villages. Other villages might view the Hidden Leaf as even more powerful or might be more cautious in their interactions with it. His new rank could also open up opportunities for diplomatic missions or alliances that weren't possible before.
He faces tougher opponents. In the Chunin Exams, the competitors are more skilled. Naruto has to deal with more complex jutsus and battle strategies from his rivals. Also, he has to prove his leadership skills, which is crucial for a Chunin.
The plot could involve Naruto passing on his unique skills and values to the new generation of ninjas. He might teach them about the importance of teamwork, just like how he learned with his own team. For example, he could share his experiences in the Chunin Exams and how they shaped him as a ninja.
One possibility is that he gains enhanced speed and stealth. As a chunin, he'd need to be more covert in his missions. He could learn to move so quietly that even sensors would have a hard time detecting him. And his speed could be on a level where he can quickly close the gap between him and his enemies without them realizing it until it's too late.
His relationship with Sasuke might become more competitive. Since they are both aiming for higher levels of ninja skills, they would constantly push each other. With Sakura, Naruto might be more respected as he has achieved the Chunin rank, and she could see him in a new light.
His relationship with Sasuke could become more competitive yet respectful. They'd both see each other as equals in a new way. Sasuke might start to see Naruto as a real rival worthy of his attention, and Naruto would be more confident in their interactions.
Sarada might be initially shocked and sad. She loves both her parents, and the divorce would be a huge blow to her. She could become withdrawn for a while, not wanting to talk to her friends about it.