Obviously Naruto and Hinata are the main ones. Their children, like Boruto and Himawari, would also be key characters. Maybe even include some of Naruto's friends like Shikamaru, who could be like an uncle figure to their kids, giving them advice and helping them out in tricky situations.
Hinata's family members, such as her father and sister, could play important roles too. Her father might have changed his views on Naruto completely and now be a source of wisdom for the family. Her sister could be like a fun aunt, teaching the kids some unique Hyuga skills that Hinata might have forgotten or didn't have the chance to teach. Also, Kakashi could make an appearance, perhaps as an old mentor to Naruto, still guiding him in some aspects of family life and ninja duties.
You could also include some of the new generation of ninjas as friends or classmates of Boruto and Himawari. For example, Sarada, Sasuke and Sakura's daughter. She could be a rival and friend to Boruto, and through their interactions, it could show the dynamics between the two families. Plus, characters like Mitsuki, Orochimaru's creation, could add an interesting element to the fanfiction, with his unique abilities and mysterious origin affecting the Naruto - Hinata family in some way.
A practical answer is Chapter 132, because it turns the idea into a concrete scene. The chapter opens with The new girl in the live-streaming room went crazy., adds pressure through Stay away from my fragrant and fresh Brother Daniu!] [Not only has the..., and ends on He stir-fried the other.
Look to Chapter 124 for the clearest answer. It begins with Since there were too many points cards inside Jiang Li's barrel, Director..., keeps building through However, Jiang Li merely lifted her eyelids and said indifferently, "No..., and lands on No need to repeat that number three times.].
Chapter 86 is the strongest chapter-level answer because it starts from After over an hour of fuss, it was finally time to eat. and follows through on But then her expression became resolute and arrogant..
If you want the clearest chapter reference, go to Chapter 72. Early on, Jiang Yan was still griping when suddenly a fair hand reached out beside...; later, the chapter leans on I'll take these, thank you." In an instant, five pairs of eyes stared over....
Look to Chapter 111 for the clearest answer. It begins with The main room's door was pushed open just a crack, and the head of the..., keeps building through Miss Jiang, you're still up, that's great., and lands on This time it was in a dream..
A practical answer is Chapter 84, because it turns the idea into a concrete scene. The chapter opens with When the villagers tasted his curry beef one by one, their faces revealed..., adds pressure through [Pfft, and she's teaching others how to cook, isn't it just scrambled eggs..., and ends on.
Chapter 94 is the strongest chapter-level answer because it starts from Jiang Li really has some skills, being able to figure that out." "Can the... and follows through on Brother is going to dress you up; look how pretty this outfit is."....
Chapter 100 is the strongest chapter-level answer because it starts from The barrage was about to die of laughter. and follows through on Her eyes flickered slightly as she grabbed the hand.. The payoff is that the chapter closes with [I finally believe this show isn't scripted, it's too abstract.
The best chapter pointer here is Chapter 84, "Is it Just About Having Hands?". It opens with When the villagers tasted his curry beef one by one, their faces revealed... and closes on Why am I tasting sand in my mouth?" Wen Jiaojiao's bravado gradually....
Chapter 113 is the strongest chapter-level answer because it starts from The next day, Jiang Lili was up before dawn as usual. and follows through on If things are really as you say, that is indeed quite serious..