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.
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.
Perhaps he struggles with his new identity as an archangel while still having the memories of his past life as Harry Potter. He could have a hard time fitting into the angelic realm, yet also find new allies among the angels who are intrigued by his unique situation.
One interesting plotline could be the main character using their wishes to change some of the major events in the Harry Potter universe. For example, they might wish to prevent certain characters from dying. Another could be using a wish to gain a special power that helps them in their adventures at Hogwarts, like being able to communicate with magical creatures more easily.
One interesting plotline could be Harry exploring the ancient Peverell heritage and discovering long - lost magic associated with the Peverells. Maybe he finds a hidden Peverell vault filled with powerful artifacts. Another could be his interactions with other descendants of the Peverells, which might lead to new alliances or rivalries.
One interesting plotline could be Harry, now as Petunia, trying to prevent the Dursleys from being so cruel to the real Harry. Since he has the knowledge of his past life, he might use it to subtly change the family's attitude. Another could be his interactions with the wizarding world in this new identity. He would have to hide his true self while still being involved in some way.
Another plotline could involve the founders trying to fix the problems they see in Hogwarts today. Maybe they are not happy with how the houses are divided now and attempt to create a more unified system among the students.
One possible plotline could be the main character using their new identity as a Black to uncover long - hidden family secrets within the Black family tree. Maybe they find out about forgotten magic or alliances that can help them in their new life.
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 interesting plotline could be about the Founders' initial meetings and how they decided to build Hogwarts. Maybe they had different ideas at first but then came to a consensus on the school's values and layout.
Well, perhaps in this fanfiction, the Phoenix plays a role in revealing hidden secrets about Harry's family. It could lead Harry to discover an ancient magic that was long forgotten by the wizarding world, which was somehow related to his family. This could then set him on a new quest, different from the one in the original books, and change the course of the story completely.