Sure, there are jutsus aplenty in the Naruto manga. They range from elemental jutsus like Fire Release and Water Release to powerful sealing techniques. These jutsus play a crucial role in shaping the battles and character development within the manga.
Kisame would probably be very angry at first. Samehada is his weapon and has been with him for a long time. He might feel betrayed and try to get Samehada back by force.
Iruka could be an important character. He's always been like a father figure to Naruto, and now with this new revelation, he might have to help Naruto deal with it. Hinata could also be in the story, and her feelings for Naruto could be complicated by his connection to Kisame. And then there could be some original characters created just for this fanfiction, like a ninja who was a former ally of Kisame and has some information for Naruto.
There could be. Fanfiction is a vast realm where all sorts of ideas are explored. However, I'm not sure if there is a highly popular or mainstream 'naruto is kisame apprentice' fanfiction. It might be a more niche concept, but it's entirely possible that some creative writer has delved into this idea to create an interesting story about Naruto learning from Kisame, perhaps incorporating Kisame's unique fighting style and view of the ninja world into Naruto's growth.
At first, it would be full of suspicion. Naruto is a Konoha ninja and Kisame is from the Akatsuki. But as the teaching progresses, they might develop a mutual respect. Naruto would respect Kisame's power and knowledge, and Kisame might respect Naruto's determination.
In Naruto fanfiction, forbidden jutsus often include things like the Edo Tensei in a more extreme or modified form. However, it's important to note that adult fanfiction may contain inappropriate or non - canon elements that deviate from the original Naruto story. So, it's better to focus on the official Naruto lore for a more accurate understanding of jutsus.
A really interesting secret jutsu in Naruto fanfic could be the 'Energy Absorption Jutsu'. This jutsu enables the user to absorb any form of energy, whether it's chakra - based attacks or natural energy from the surroundings. It gives the user a huge advantage in battle as they can then use the absorbed energy to power up their own attacks. There might also be a 'Teleportation Gate Jutsu' which creates multiple gates in different locations that the user can instantly teleport between. And the 'Aura Manipulation Jutsu' where the user can manipulate their own chakra aura to have different effects, like creating a shield or enhancing their physical abilities.
Well, in some fanfictions, Naruto might defeat Kisame in a battle and take the sword as a trophy. Maybe he uses his newfound Sage Mode powers or some other advanced jutsu to overpower Kisame and claim the sword.
One idea could be a story where Naruto and Kisame are forced to team up during a mission that has a greater threat to the ninja world. They start off distrusting each other but gradually come to respect one another's skills.