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.
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.
One possible plot could be that Naruto becomes an all - powerful ninja who uses his knowledge of all jutsus to bring peace to the ninja world. He could travel from village to village, teaching the jutsus to others and uniting the different ninja clans.
Well, in Naruto fanfiction, creating new jutsus is a creative process. Some ninjas could create jutsus based on their emotions. For instance, a ninja who has experienced great loss might create a jutsu that is related to grief, like a jutsu that summons dark energy. Additionally, ninjas can also create jutsus by collaborating with others. Two ninjas with different elemental affinities could work together to create a combined - element jutsu. And sometimes, it's just pure inspiration from a dream or a vision that a ninja has, which then leads to the development of a new and unique jutsu.
Minato would likely be extremely shocked. Naruto is his son, and the idea of Naruto attacking him would be completely unexpected. He would probably try to talk to Naruto first, to find out what is wrong and why he is being attacked.
Another jutsu Naruto could learn is a defensive one. Given that Kotetsu and Izumo have to protect themselves and others, they might teach Naruto a jutsu that creates a stronger shield or barrier. This would enhance Naruto's survivability in battles, especially against powerful opponents. It could be a jutsu that combines chakra control and some form of elemental manipulation, which Naruto can then adapt to his own style with his large chakra reserves.
Naruto might create a jutsu that uses his Uzumaki clan's sealing techniques along with his chakra. Maybe a sealing - Rasengan that can seal an opponent's chakra for a short time. Sasuke could come up with a jutsu that uses the power of the Rinnegan and his own lightning - style chakra to create a super - charged lightning attack that can cut through almost anything.
Kushina could be an important character even though she's dead in the original story. In this fanfic, her spirit or memories could play a role in Naruto's upbringing. For example, Minato could tell Naruto stories about Kushina's feisty personality and her love for the village.
On a more personal level, they could face internal guilt. As Naruto grows up and achieves great things on his own despite their neglect, Minato and Kushina may realize what they've missed out on. This realization could cause them a great deal of internal turmoil and regret for not being there for their son when he needed them.