Well, you could focus on the relationship between the jinchuuriki and their extended family members in the fanfiction. For instance, how does the jinchuuriki's relationship with their grandparents change when they find out about the tailed beast? Also, a plot could revolve around the family trying to help the jinchuuriki control the power of the tailed beast. They could seek out ancient scrolls or wise sages to learn techniques that would make it easier for the jinchuuriki to co - exist with the beast.
One idea could be exploring the relationship between the Jinchuuriki and Shukaku in more depth. Maybe the Jinchuuriki tries to communicate with Shukaku in a different way than in the original series, leading to new powers or understandings. Another plot could involve the Jinchuuriki being targeted by a new group who wants to use Shukaku's power for their own evil purposes. The Jinchuuriki then has to fight not only to protect themselves but also to keep Shukaku from being misused.
One idea could be exploring the daily lives of the Jinchuuriki in the village. How they interact with each other, share their experiences of being hosts. Another could be a story about a new Jinchuuriki arriving at the village and how they struggle to fit in.
A possible plot is that the Three - Tails Jinchuuriki discovers a unique ability related to the tailed beast that no one else knew about. For example, they could find a way to use the Three - Tails' chakra to heal others in a time of great need. This could also attract unwanted attention from those who would misuse this power. They then have to protect this new - found ability while also dealing with the normal challenges of being a Jinchuuriki.
In this fanfiction, the plot could revolve around Naruto and the Jinchuuriki family being hunted by a powerful organization. They are forced to go on the run and hide in different parts of the ninja world. During this time, Naruto discovers more about their shared heritage as Jinchuuriki. They also have to deal with the internal struggles of some Jinchuuriki who are not fully accepting of their role, and Naruto has to use his leadership skills to keep them together and safe.
One idea could be exploring the relationship between Naruto and the fox family in more depth. For example, how they interact on a daily basis, their traditions, and how Naruto adapts to being part of this unique family. Another could be a story where the fox family has to protect Naruto from an unknown threat, showing their loyalty and strength. Maybe also a plot where Naruto discovers a long - lost secret within the fox family that could change the entire shinobi world.
One idea could be exploring Kushina's life before Naruto was born in more detail. Maybe show her training as a jinchuriki and how she met Minato. Another could be a story where Naruto discovers a hidden journal of Kushina's that reveals family secrets and advice for him.
Perhaps in this fanfiction, Naruto and Konan's families are brought together because of a mysterious illness that only their combined family lineages can cure. They have to search for ancient remedies and along the way, they learn about each other's family histories and traditions. Their kids could play a crucial role in finding the cure, using their own budding skills and the bond between the two families.
A really interesting plot for 'kakashi and naruto family fanfiction' could be that Kakashi accidentally stumbles upon a secret power within Naruto's family that has been dormant for generations. He then helps them unlock and control this power. Along the way, they form a stronger bond as a family. And as Kakashi is involved, he also rediscovers some of his own values and beliefs through this process.
Another plot could involve the Kyuubi having a more sentient and family - like relationship with Naruto's family. It could communicate with them in dreams and offer advice or warnings. For example, it might warn them about upcoming threats to the village that Naruto alone might not be able to handle. This would create a unique dynamic where the family has to work with the Kyuubi for the greater good.
A possible plot for Naruto Akatsuki Family Fanfiction is the Akatsuki members raising a child together. This child could be a powerful being that they found or created. They would have to teach the child their ways, and in the process, the Akatsuki members might change themselves. For instance, Hidan might become more patient while teaching the child about their beliefs, and Kakuzu might learn to be more giving when it comes to providing for the child's needs.