One possibility is that Naruto has been on a long and secret mission. During this mission, he somehow ends up taking care of a baby. Maybe the baby is an orphan from a village he saved. Naruto, with his big heart, couldn't leave the baby behind. So he returns to the Hidden Leaf Village with the baby, causing a stir among his friends and the villagers. Some might be worried about how he can handle being a ninja and taking care of a baby at the same time, while others are just happy to see him back.
Perhaps Naruto found the baby while exploring a new and dangerous area. The baby was in a perilous situation, and Naruto's sense of justice made him rescue it. When he returns with the baby, the village has to adapt to this new addition. The baby might bring new challenges and opportunities for the village. Naruto would have to juggle his duties as a ninja and his new role as a caretaker. He might also seek advice from his old mentors like Kakashi on how to raise the baby in the ninja world.
The story could also be that Naruto has a child of his own in a rather unexpected way. He returns with the baby, and the baby might have some special powers or abilities. For example, the baby could be a key to unlocking an ancient prophecy that is related to the future of the ninja world. His friends, like Sasuke, would be both curious and cautious about the situation, and Naruto would have to prove that he can be a good father while still being the hero of the village.
It could be a completely new character. Maybe Naruto met her during his travels, and for some reason, she had to entrust the baby to Naruto. This could be due to her being in danger or having some kind of mission that made it impossible for her to take care of the baby herself.
One possible storyline could be that Naruto and Ino start off as friends who gradually realize their deeper feelings for each other. Maybe they go on a mission together and during that time, they face a dangerous situation that makes them see how much they mean to one another. After getting married, they discover they are expecting a baby. Ino would be a very protective mother, using her mind - related jutsu to keep the baby safe even before it's born. Naruto, on the other hand, would be super excited and probably start training early on how to teach the baby ninjutsu.
One possibility is that Naruto is summoned to Rias' world through some sort of magical ritual gone wrong. Once there, he forms an unlikely alliance with Rias. Naruto's chakra - based powers could be a great asset to Rias' team. They might start training together, with Naruto teaching the devils about chakra control and Rias showing Naruto some of the unique magic in her world.
Perhaps in this fanfiction, Naruto returns to Erza because there is a prophecy that only he can fulfill in her world. He might bring new hope to the people there. He could also learn some new fighting techniques from Erza and her comrades while sharing his own ninja knowledge. This would lead to an interesting exchange of cultures and fighting styles.
Another idea is that the girlfriend is actually someone with a mysterious past related to Naruto's own past, like she might be related to an old enemy or have some connection to the Nine - Tailed Fox. This would add a whole new layer of mystery and intrigue to the story. Naruto would have to deal with not only his feelings for her but also the secrets she might be hiding and how they could affect the safety of Konoha.
In the 'naruto family returns fanfiction', it could be that Naruto's family returns to the village during a time of celebration, like a big festival. But they soon find out that there are some underlying issues in the village, such as political unrest or a new group of villains secretly operating. Naruto then decides to use his influence and his family's combined strength to solve these problems and bring peace back to the Hidden Leaf. He might also use this opportunity to teach his children about the importance of protecting their home and the values of the ninja way.
One possible plot could be that Naruto has been on a long and secret mission. During this time, he met someone and had a child. Now he returns to the village with the child, and the villagers are both shocked and curious. His friends, like Sasuke, might be initially skeptical but then come to accept the new situation. The child could also have some unique powers inherited from Naruto, which could lead to various adventures as they try to figure out how to control and develop these powers.
In this fanfiction, the plot might involve Kushina coming back to help Naruto in his toughest battles. Maybe she uses her unique chakra abilities that Naruto has inherited to give him an edge. She could also provide emotional support, as Naruto has always longed for his mother.
In such a fanfiction, Naruto might return to Sakura with newfound powers. Maybe he comes back after a long and dangerous mission. He could finally confess his long - hidden feelings for Sakura, leading to a romantic reunion.
The plot could involve Naruto coming back to find that the political situation has changed. Temari, being from Suna, could be there to help Naruto navigate the new power dynamics. They might have to deal with other villages that are becoming more aggressive. Naruto's return with Temari could also signal a new era of cooperation between the Leaf and Suna, and they could be at the forefront of diplomatic efforts. Plus, there could be some personal moments between them, like Naruto finally realizing his feelings for Temari during their adventures together.