A common plotline is the sister having a special power or ability that aids Naruto. For example, she might have a healing ability that helps Naruto recover from his battles faster. Another is the sister being involved in Naruto's search for Sasuke. She could be the one who tries to convince Sasuke to come back to the Leaf Village when Naruto fails at first.
One interesting Naruto adopted sister fanfiction could be 'The Adopted Uchiha'. In this story, the sister, who is adopted into the Uzumaki family, has some hidden Uchiha lineage. It shows her journey of discovering her powers and fitting into the Naruto universe. Another great one is 'Sister of the Jinchuriki' where she plays a crucial role in Naruto's life, helping him control the Nine - Tails' power at times.
The adopted sister could actually strengthen Naruto's relationships. She could bring a new dynamic to their group. Naruto would be more responsible as he has someone else to look after. His friends would see this growth in him and respect him more. They might also start to include the sister in their activities, like inviting her to training sessions or parties, which would further integrate her into their circle.
There could be a fanfiction where Sasuke and his older adopted sister are involved in a mystery. They start to notice strange things happening in their village. They work together to solve the mystery, using their different perspectives. The sister might be more cautious while Sasuke is more impulsive, which could create some tension and also comical situations in the story.
In fanfiction, their relationship can be complex. The older sister might act as a protector for Sasuke. For example, she could shield him from the darker aspects of the ninja world when he was young. This would create a deep sense of trust between them.
Another plotline could involve the adopted sister coming from a different village and having a hard time adjusting to life in Konoha. Naruto, having been an outcast himself, can relate to her struggles. He shows her around, introduces her to his friends, and they gradually form a strong bond as she starts to feel at home.
One possible plot could be that Naruto's little sister is also a ninja in training. She might struggle with the same kind of ostracism Naruto faced because of the Nine - Tails inside him. However, she could also be a source of great support for Naruto, helping him through his toughest times and together they could train to become stronger. Maybe she has a unique ninja ability that even Naruto is in awe of.
Well, perhaps the story could be about Naruto finding out he has a sister who was hidden away for her own safety. Maybe she has some unique powers that the villains are after, and Naruto has to protect her while also learning about his family's past.
One possibility for Sansa's adopted sister in fanfiction is that she could be a spy. Maybe she was adopted by the Starks under false pretenses, but actually sent by an enemy. However, as she grows up with Sansa, she starts to have a change of heart. She could then use her position to feed false information back to her original masters, all while protecting Sansa and the Stark family from harm.
No. Incestuous relationships are generally not considered acceptable in most fanfiction communities. The Naruto series promotes positive values and family bonds that are normal and healthy. Having such a plot goes against the general moral and ethical standards that the Naruto fanfiction community typically adheres to.