Well, in some 'naruto himawari immortal fanfiction', one interesting idea could be Himawari's exploration of her newfound immortality. She might use it to protect the Hidden Leaf Village in ways that others can't. For example, she could take on extremely dangerous missions without the fear of death.
A 'naruto x himawari fanfiction' could explore a future where Himawari has to step up and protect the village while Naruto is away on a long - term mission. Naruto left her with some special advice, and she uses it to overcome various challenges, making the village proud and showing how she's following in her father's footsteps.
A fanfiction could explore Himawari starting to show signs of her own unique ninja abilities, and Naruto and Hinata trying to figure out the best way to help her develop them. Maybe she has an ability that neither of them has seen before, which causes some confusion and also excitement in the family.
One interesting idea could be Naruto exploring eternal life while still protecting the Hidden Leaf. He might face new challenges as he outlives his friends and has to deal with the loneliness that comes with immortality.
A plot could revolve around Himawari getting lost in a mysterious part of the village or forest, and Naruto going on a search to find her. Along the way, we could see flashbacks of their past moments together, and when he finally finds her, it would be a very emotional reunion. This would highlight Naruto's love for his daughter and his protective nature.
One idea could be a story where Himawari and Boruto go on a secret adventure together outside the village. They encounter a strange new jutsu and have to figure out how to deal with it, relying on their unique sibling bond.
One idea could be a story where Himawari discovers a new ninja technique and Naruto helps her perfect it. They could have training sessions together, and Naruto shares his own experiences from when he was learning new jutsus. This would strengthen their bond as father - daughter and also show Himawari's growth as a ninja in - training.
One interesting idea could be the concept of an immortal OC (original character) interacting with the well - established Naruto universe. For example, their immortality might lead to unique relationships with the mortal characters. They could have witnessed countless historical events in the Naruto world and thus possess a wealth of knowledge that others don't. This could potentially change the course of the story as they might use this knowledge to influence the actions of the main characters like Naruto or Sasuke.
One interesting idea could be the combination of Naruto's ninja abilities with RWBY's unique combat styles. For example, Naruto's shadow clone jutsu might be used in creative ways in the RWBY universe, like having clones perform different team maneuvers simultaneously. Another idea could be the exploration of immortality in the context of both worlds. How would an immortal character interact with the challenges and power dynamics in Naruto and RWBY? It might also involve crossovers of characters' relationships, like how Naruto's friends would get along with RWBY's team members.
One interesting idea could be Naruto achieving a new level of power that makes him seem like an immortal god. For example, he might gain the ability to control time, which is a very cool concept in fanfiction. It could add a whole new layer of complexity to his battles and relationships.
Obviously, Himawari would be one of the main characters. Since it's about her immortality, she's at the center of the story.