In addition to the main family members, characters like the Third Hokage could be included. He played a big role in Naruto's life and was also around when Kushina was in the village. Also, the other Jinchurikis might be interesting to add, as Kushina was one, and they could share experiences or knowledge.
Obviously, Naruto and Kushina are must - includes. Minato is also very popular as he is Naruto's father and Kushina's husband. Another character could be Jiraiya, since he was Minato's teacher and had an influence on Naruto's life too.
Some might choose to include Kakashi. He was Naruto's teacher and had a connection to Minato as well. And of course, characters from the Uzumaki clan, if the fanfiction delves deeper into their family heritage, like Nagato who was also an Uzumaki. This could add more depth to the story about the family.
Naruto and Hinata are obvious choices as they are central to the family. Their relationship and how they raise their children are always interesting to explore.
Their children are also very popular. Boruto and Sarada, for example. Fanfiction often explores their relationship as the children of two of the most important ninjas in the village. They might have a lot of pressure on them, and exploring how they deal with that while also having their own friendship or rivalry is great content.
Naruto himself is obviously a must - include. Hinata is also very popular as his wife. Their kids, like Boruto and Himawari, are often featured. Also, characters like Sasuke can be included as Naruto's long - time friend who might interact with his family.
In naruto jinchuuriki family fanfiction, Naruto and his family are key. But don't forget about the other jinchuuriki like Yugito Nii. Her family could be explored, especially how they dealt with her being a jinchuuriki in the Hidden Cloud Village. Roshi from the Hidden Stone Village is another jinchuuriki whose family could be a part of the story. Also, considering the Akatsuki's interest in jinchuuriki, characters like Itachi and Sasuke could be included in relation to how they interact with jinchuuriki families. For example, Itachi's actions might have had an impact on the families of the jinchuuriki he was involved with, which could be a very interesting angle to explore in the fanfiction.
Obviously Naruto and Boruto themselves are very popular. But characters like Hinata, Naruto's wife, also add a lot to the family dynamic in fanfiction. Sasuke is another one, as he has a complex relationship with Naruto and can be involved in the story in many ways. For example, he could be a mentor to Boruto. And of course, the older generation like Kakashi can also be included to give some wisdom and guidance to the family.
Kakashi is also well - liked. As Naruto's former teacher and a respected ninja in his own right, he can play a mentor role even when Naruto is Hokage. His laid - back yet highly skilled nature is fun to write about.
Gaara is a great character for 'naruto kage fanfiction'. He has an interesting backstory, going from being an outcast to a respected kage. His unique abilities and his friendship with Naruto can add a lot to the story. Tsunade is also popular. Her strength as a female kage and her medical ninjutsu knowledge can be interesting aspects to incorporate. And then there's A, the Raikage, with his powerful physique and no - nonsense attitude.
Batman is definitely a popular choice. His detective skills would be very useful in dealing with supernatural mysteries. He could use his knowledge of Gotham's history and its hidden secrets to figure out what's going on when faced with supernatural threats.
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.
Well, Naruto himself is extremely popular in relation to them. He has connections to Kushina as her son, and his interactions with Kurenai also add to his popularity in these scenarios.