I don't know who the author of Minato Novel is. There are so many novels out there and without more information, it's impossible to determine the author.
Well, Naruto is a main character in all Hashirama Naruto fanfics. He has his own personality, goals, and abilities that are further developed in these stories. Hashirama is also key. He is often portrayed as a mentor - like figure to Naruto. His influence on Naruto can be in terms of combat skills, understanding of the village's values, or even in Naruto's personal growth. Additionally, there could be other supporting main characters depending on the plot. For example, if the fanfic focuses on a war - time scenario, characters like Tobirama (Hashirama's brother) might also be main characters in that particular fanfic.
I'm not sure who Anna is. Ding Jie asked if the female celebrity's name could be a fictional female celebrity or a character related to a female celebrity, but I didn't have enough context to answer this question. If you can provide more information, I will try my best to answer your questions.
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.
Another great author could be Ryu. Ryu has a knack for creating unique plotlines that involve Hashirama and Naruto. They often incorporate elements from different arcs of the Naruto series in their fanfictions, which gives a sense of familiarity yet novelty. Their stories usually have great character development for both Hashirama and Naruto.
Madara Uchiha would be an excellent character to include. His long - standing relationship with Hashirama, filled with both friendship and enmity, and his connection to Sasuke and the overall ninja world's history would make for a very engaging fanfiction.
Tobirama should be included. As Hashirama's brother, he has a complex relationship with Hashirama. In a fanfic, his interactions with Naruto could be really interesting. Maybe Naruto could try to bridge the gap between Tobirama's old - fashioned views and the more modern ways of the village in Naruto's time.