Well, perhaps the story starts with the fuinjutsu master being sent on a special mission. Along the way, he meets various female characters from different clans. As they see his amazing fuinjutsu abilities, they start to develop feelings for him. The harem aspect then kicks in as he tries to understand his own feelings towards them, all while using his fuinjutsu to solve mysteries and fend off enemies.
Sakura could be one of the main female characters. She's strong - willed and her medical ninjutsu skills could complement the fuinjutsu master's abilities. Another could be Hinata, with her gentle nature and Byakugan abilities. And maybe Ino, as she is also quite competitive and could add an interesting dynamic to the harem.
It could also be a new character created specifically for the fanfiction. This character might be an old hermit who has been living in Konoha in secret and is now passing on his knowledge of Fuinjutsu to Naruto or other characters. Maybe he has a special connection to the founding of Konoha and the original development of Fuinjutsu.
Well, they might have the ability to create extremely powerful sealing jutsus. For instance, they could seal away powerful demons or enemies with ease. Just like how the Fourth Hokage sealed the Nine - Tails in Naruto, the Fuinjutsu master could do similar things but perhaps on an even grander scale.
Perhaps Naruto and Krutosuchi team up to create a super - powerful Fuinjutsu seal. They could combine their unique chakra natures and knowledge. For example, Naruto's Uzumaki bloodline gives him strong chakra reserves which could be used to power a large - scale seal that Krutosuchi designs. This seal could be used to protect the Hidden Leaf Village from a new and powerful enemy.
A plot twist could be that Naruto's Fuinjutsu skills are actually part of a prophecy in Kumo. The village initially hid this from him, but as he progresses in learning, he discovers the truth and has to deal with the implications.
Jiraiya could teach Naruto the basic sealing techniques like the Five - Element Seal. This seal can be used to disrupt an opponent's chakra flow. He might also teach him more advanced storage seals, where Naruto could store items or even his own chakra for later use. Another possible technique could be the Summoning Seal, which Naruto could use to summon various creatures or objects.
One great 'fuinjutsu master naruto fanfic' is 'The Seal Master'. It shows Naruto's journey in mastering fuinjutsu in a really unique way, with exciting battles against new villains. Another one could be 'Naruto: Fuinjutsu Prodigy' which focuses on his training with an ancient master of seals.
Well, it could be about Naruto during a holiday like Christmas. He might be surrounded by a harem of his female friends from the village. Maybe they all decide to celebrate together and there are some romantic and comical moments as they exchange gifts and have a big dinner.
In a 'Naruto betrayed harem fanfiction', it could be that Naruto is blamed for something he didn't do within the harem. For example, a valuable item goes missing and the harem members quickly point fingers at Naruto. They don't believe his innocence and start to shun him. Naruto then realizes that these people he thought were his friends in the harem are not so trustworthy after all, and thus he experiences betrayal.
In Naruto fanfiction, the combination of Fuinjutsu and blacksmithing can be really interesting. Fuinjutsu is all about sealing techniques, and when combined with blacksmithing, one can imagine creating weapons with sealed powers. For example, a sword that has a sealing jutsu inscribed on it to trap the opponent's chakra when it strikes. It adds a whole new layer of creativity to the Naruto universe.