One way to interact is through the medical field. The reborn character could work with Sakura in the hospital, treating patients. They could introduce new medical techniques from their past life. In addition, they could participate in ninja battles not just as a fighter but also as a strategist, using their knowledge of different battle strategies. This would help Sakura and the rest of the team in their missions and also gain respect in the ninja community.
Well, they could interact with the Naruto world by getting involved in the village politics. Since they are reborn as someone close to Sakura, they might have an influence on how the Hidden Leaf Village is run. For instance, they could suggest new medical policies based on their modern knowledge. Also, they could befriend other characters like Naruto and Sasuke, and through their interactions, they could introduce new ideas and technologies to the ninja world. This would not only change their relationships but also the overall dynamic of the Naruto world.
Chapter 334, "Hanqiong's Seven Divisions, Moao Mountain, Hearing Beishuo Again", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The chapter turns that into something concrete by moving from Year three of Great Xia, the sixth day of August, just after... to Lu Yang never intended to compare with Long Mountain..
Chapter 104, "Hurry up and sign the termination letter, come back to me!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. It opens with Zhao Lang let out a light chuckle, "Young Master Jiang, don't be...
Chapter 339, "The Changes of Li Hu and Yang Zhong, the Hou Family's Opportunity, Advice (Part 4)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on Only now did Yang Zhong remember that Li Tiancheng in front of him is... and ending on Just from the personnel configuration, you can tell how significant....
Chapter 348, "Schemes and Counter-Schemes, the Five of East Ridge, Zhu Yang's Threat, The Dust Settles (Part 4)", is the clearest early answer because it turns Luo Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Upon hearing that Yanggu had sent someone first, Lu Yang raised his... and follows through with Once Hong Yang replaced him as the platform leader, Zhu Ling couldn't....
Chapter 165, "Boom! Jiang Yan is actually Su Yinwan's fanboy?!", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from How come everyone else got a solid six points, and he ended up with...
Chapter 82, "Jiang Yan and the Chicken Go Viral!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 331, "Zhu Shun, Huang Tianxi, the Third Cold Yuan Banquet of Great Xia, and Xia Yuzong", is the clearest early answer because it turns Huang Yong's situation into a concrete plot event. The chapter gives readers a real answer by opening on Inner City's main street, Zhu Shun led his wife Huang Yuniang and... and ending on But later, as the Camp Supply Department sent over the ceremonial....
Chapter 353, "He's Lying!", is the clearest early answer because it turns Liu Suqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from The three of them turned their heads together.
Chapter 350, "Methods to Enhance the Peak of Cold Resistance, Moao's 10th Town, Beishuo Yang Fa, Nightmare, East Ridge Lu Yun", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter turns that into something concrete by moving from He didn't care whether Zhu Yang on the ground understood or not. to The construction cost of an eight-meter wide straight road is not....
Chapter 381, "You are Liu Suqing's Daughter", is the clearest early answer because it turns Destiny's situation into a concrete plot event. The chapter turns that into something concrete by moving from Yu Tiantian was even more baffled now.