Obviously Naruto and Kushina are the most important. But Minato, Naruto's father, also plays a big role as he is part of the family. Also, characters like Jiraiya, who was Minato's teacher and had an influence on Naruto as well, could be important in the fanfiction.
The key characters would be Naruto and Kushina for sure. Then there's the Fourth Hokage, Minato. He was Kushina's husband and Naruto's father. Additionally, the Uzumaki clan members could be important. Even if they're not directly in the story all the time, their legacy and the family's past are relevant. For example, an older Uzumaki relative who passed on some wisdom to Kushina that she then passes on to Naruto.
The best chapter pointer here is Chapter 142, "From Enemy to Best Friend?!". It opens with The ingredients for making Buddha Jumps Over the Wall were still on their... and closes on Wen Jiaojiao immediately lit up and stepped forward to hug Jiang Li's arm..
A practical answer is Chapter 122, because it turns the idea into a concrete scene. The chapter opens with Damn, are we supposed to find the points card in the mud?!" He had just..., adds pressure through It wasn't intentional!" Bullet screen: "[Qi Tianyu, you really need to be..., and ends on He.
If you want the clearest chapter reference, go to Chapter 103. Early on, Jiang Yan looked at Zhao Lang with suspicion, eyeing the dark substance in...; later, the chapter leans on It's not going to make my face fester, is it?" Zhao Lang smiled, "Do I....
A practical answer is Chapter 116, because it turns the idea into a concrete scene. The chapter opens with But before the audience in the live room had time to continue brewing the..., adds pressure through So, he quickly nodded as if pounding garlic, "That would trouble Sister Li..., and ends on.
The best chapter pointer here is Chapter 120, "Jiang Li Can Actually Do Acupuncture?!". It opens with Facing the sudden and somewhat strange request from Jiang Li, Director Sun... and closes on Drink this." Wen Jiaojiao looked at the half cup of thick substance:....
Chapter 153 is the strongest chapter-level answer because it starts from Wisps of smoke gradually rose from the small kitchen. and follows through on After leaning in, he saw Jiang Li and Zhao Lang inside the kitchen..
The best chapter pointer here is Chapter 102, "The production team can't take a joke!". It opens with When the camera cut back, the three of them had already returned to the... and closes on The cameraman, with a blank expression, turned off the camera, causing....
If you want the clearest chapter reference, go to Chapter 145. Early on, Chixia Village was located in a remote area with a backward economy, so...; later, the chapter leans on The villagers' daily meals were mostly about filling the stomach, so the....
A practical answer is Chapter 109, because it turns the idea into a concrete scene. The chapter opens with And another thing," Jiang Li said, taking out a tissue to wipe her lips,..., adds pressure through Get them to find him, no matter the cost, I want to ensure Jiang Yan can't..., and ends on.
A practical answer is Chapter 135, because it turns the idea into a concrete scene. The chapter opens with The sun blazed down mercilessly, but thankfully, the path to the mountain..., adds pressure through At this moment, it seemed more likely to be grim than not., and ends on Are you healed from.