His speed would likely be a huge advantage. He could be faster than most wizards in combat or when running from danger. For instance, in a duel, his quick reflexes would allow him to dodge spells more easily.
One possible plotline could be Minato having to navigate the challenges Naruto faced as a child, like dealing with the villagers' hostility, but with his own knowledge and skills from his previous life. He might use his experience as Hokage to quickly gain respect and start making changes in the village at a younger age.
One interesting plotline could be Minato using his ninja skills in the wizarding world. For example, his speed and stealth might help him in tasks like sneaking around Hogwarts undetected. He could also use his sealing jutsu in unique ways, perhaps to contain dark magic or protect secrets.
In 'Naruto Reborn as Minato' fanfiction, an exciting plot point might be how Naruto, now as Minato, would handle the threat of the Nine - Tails. Since he has his own experiences with the Nine - Tails from his previous life as Naruto, he could potentially find a different way to manage and even befriend the beast. He might also change the way the village views the jinchuriki. Instead of being feared, he could make them more respected. Moreover, his leadership style as Minato could be influenced by his Naruto - like values, leading to a more inclusive and progressive Hidden Leaf Village.
Character development in this fanfiction is quite complex. Naruto, now reborn as Minato, first has to deal with the physical and social aspects of being Minato. Physically, he has to perform Minato's jutsu and combat skills as well as he can. Socially, he has to interact with the other characters in a way that is befitting of Minato. But on an emotional level, he is still Naruto. So, he might start to change Minato's character from the inside. For example, Minato was always a bit distant in his leadership style. Naruto might make it more approachable. He could also develop Minato's relationships in new ways. His relationship with Jiraiya, for instance, could become more like a partnership of equals rather than the traditional master - apprentice relationship. As he continues to live as Minato, he gradually becomes a new version of Minato that combines the best of both Naruto and the original Minato.
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.
As for Jiraiya, when Minato is reborn as Naruto, their relationship would be a strange mix of past and present. Jiraiya would see Naruto as a different person but with flashes of Minato's personality. Minato, on the other hand, would have to balance his past relationship with Jiraiya as his teacher and his current situation as Naruto. This could lead to a more complex and interesting bond, with Minato perhaps pushing Jiraiya to be more open about certain secrets earlier.
One of the main similarities is their self - sacrifice. Minato sacrificed himself to save the village and his son. Naruto has also shown that he is willing to put himself in harm's way for the greater good. He's always the first to jump into a dangerous situation if it means protecting those he loves. Another aspect is their leadership qualities. Minato was a great leader as Hokage, and Naruto has developed into a great leader as well, inspiring those around him.
The emotional bond would be stronger. Naruto wouldn't have to face the pain of growing up without a father. Minato could be there to cheer him on during his training and be a source of comfort when Naruto faced difficulties, like when he was bullied as a child. He could also help Naruto better control the Nine - Tails' power from the start.