One interesting plot could be Naruto getting a second chance at life and using his knowledge from his first life to prevent the Fourth Great Ninja War. He could focus on training his friends earlier and revealing Orochimaru's plans much sooner. This would change the entire course of the shinobi world and lead to new alliances and power dynamics.
The main antagonist could be a corrupted version of Naruto himself from an alternate timeline. This 'evil Naruto' has different ideals and is bent on ruling the ninja world with an iron fist. In Naruto's second life, he has to not only face this powerful version of himself but also figure out how to stop his own dark tendencies from emerging.
In a fanfiction where Naruto is born during the Second Shinobi War, he could potentially be a major asset to the Leaf Village much earlier. Since he's the jinchuriki of the Nine - Tails, his power could be harnessed for the war effort. However, this also means he'd be in more danger from enemy villages who would want to either capture or kill him. His relationship with the villagers might be different too. Instead of being shunned for the Nine - Tails inside him, they might see him as a necessary evil for the village's survival.
Naruto himself is often a popular character in these fanfics. Writers like to explore how his life might be different if someone with a second chance at life interacts with him.
Iruka could be an interesting character to include. He has always been important in Naruto's life and could provide a different perspective on the Second Hokage's story. Hinata could also be part of it. Her gentle nature could contrast with the more battle - oriented characters. And Rock Lee, with his dedication to hard work and the ninja way, could be inspired by the Second Hokage's own determination and contribute to the story in his own unique way.
In a 'naruto second coming fanfiction', it could also be centered around Naruto's legacy. His return might inspire a new generation of ninjas. He could become a mentor to young ninja who are facing similar challenges as he did when he was young. And his story could be a source of hope and motivation for them to strive for peace and strength in the ninja world.
I don't know who the author is. There are so many Naruto fanfiction writers out there, and without more specific information, it's hard to determine who created this particular one.
I'm not sure specifically as it could cover a wide range of things. It might be a fan - made story that focuses on a second 'flash' - like moment in the Naruto universe. Maybe it's about a new, sudden and powerful event or ability that appears in the story.
The 'naruto is the second kyuubi fanfiction' likely delves into the idea that Naruto has a unique relationship with the Kyuubi that makes him be regarded as the second Kyuubi. This could lead to a whole new set of storylines. It could explore Naruto's training in the context of this new identity. He might need to learn to control new powers or abilities related to being the second Kyuubi. Also, it could show the political and social implications within the ninja world. Villages might be more afraid of him or try to use him for their own purposes. And it could also touch on the origin of this 'second Kyuubi' concept, like if there was some ancient prophecy or some secret experiment that led to Naruto being in this position.
In many fanfictions, the idea of Naruto and Rias being married is quite interesting. It often involves combining the elements from their respective universes. For example, Naruto's ninja skills and Rias' devil powers could create a unique dynamic in their relationship. Maybe they would face challenges together, like protecting their family from threats that come from both the ninja world and the devil realm.