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.
Sakura could be a significant character. In the context of Naruto being Minato's son, her relationship with Naruto might change. She could be more in awe of him at first or have different expectations. Also, Sasuke is likely to be a main character. His rivalry with Naruto could take on new dimensions as Naruto has the added legacy of being Minato's son. Their battles and interactions might be more intense and influenced by Naruto's heritage.
Well, obviously Minato would be one of the main characters since he's in the title. Naruto might also be a main character as it's a Naruto - related fanfic. There could also be other characters like Kushina, Minato's wife, or some of Minato's students or comrades from the Hidden Leaf Village.
Another character that could be important is Jiraiya. Since he was Minato's teacher and Naruto's mentor, he could play a role in the fanfic. Maybe he helps facilitate the meeting between Minato and Naruto, or he has some words of wisdom for both of them during their time together.
Obviously, Minato and Naruto are main characters. Minato is the one who returns, and Naruto is his son, so their relationship is central.
Sakura could be another main character. She might be shocked by Naruto's arrest and start her own investigation. Maybe she teams up with Sasuke, who also has his own complex feelings towards Naruto. Their combined efforts could play an important role in uncovering the truth.
There could be Sasuke. Since Sasuke is Naruto's rival and often involved in the same major story arcs, he might play an important role in this fanfiction. His sharingan abilities could interact with Naruto's newfound speed in some interesting ways, either as an ally or an obstacle depending on the plot.
The main characters are obviously Naruto and Minato. Naruto is the protagonist of the Naruto series, and Minato is his father.
One possible plotline could be Minato teaching Naruto special jutsu early on. Since Minato was a very powerful ninja, he could pass on his knowledge of the Flying Thunder God Technique to Naruto at a young age, which would make Naruto even more formidable in battles against early foes.
Jiraiya would be a great addition. Since he was Minato's teacher, he could share stories about Minato's training days with Naruto. Kushina could also be included as she was Naruto's mother and Minato's wife. Her presence could add more family - oriented moments. Another character could be Kakashi. He was Minato's student too and could provide insights into Minato's character.
Rin could also be an important character. She could be the one who takes care of baby Naruto's day - to - day needs, like feeding and cleaning. She could also have a special bond with Naruto, perhaps seeing him as a symbol of hope for the future of the village.