If Naruto goes to Soul Society in fanfiction, it could be really interesting. He would likely be very curious about the way Soul Society operates. His chakra-based abilities would be a novelty there. He might end up teaching some of the Soul Reapers his ninja techniques, or he could learn some new spiritual powers from them. And of course, his never - give - up attitude would surely make an impression on the inhabitants of Soul Society.
Perhaps Naruto would meet Rukia first. Rukia is often out on missions and is one of the more accessible Soul Reapers. She would be really curious about Naruto's strange appearance and abilities. And Naruto would be equally intrigued by Rukia's spiritual powers and the way she handles her zanpakuto.
Fem Ichigo would likely be a very influential figure in Soul Society. As Byakuya's mother, she would be part of the Kuchiki family. She could be involved in the family's decision - making processes, perhaps having a say in matters regarding family honor, alliances, and the training of the younger members. Her unique abilities, which we assume she has from being an Ichigo - like character, could also be used to protect Soul Society from threats. For example, if there are Hollows attacking, she could use her sword skills to fight them off.
Some of them could be entertained. For those who are more open - minded, like Yoruichi, she might find it fun to see the different interpretations of their world and the characters in it. However, others, like Byakuya, might be more critical and think that the fanfiction distorts the original values and stories of the Soul Society.
One potential ally could be a friendly youkai student who is intrigued by Ichigo's godlike powers. Maybe someone who is an outcast among the youkai and sees Ichigo as a kindred spirit.
There could be some of the more benevolent yokai who see Ichigo as a potential ally. For example, the werewolf Koga might recognize Ichigo's strength and see an opportunity to team up with him against common enemies. Maybe even some of the teachers at the academy who are tired of the chaos and power plays could join forces with Ichigo.
Renji could be a key character. He could be a senior student who at first is a bit tough on Ichigo but later becomes a mentor. Orihime could also be there, and she might be in the same class as Ichigo, providing some emotional support and her own unique skills in the academy setting.
If Ichigo and Yoruichi get married, it could change the power dynamics in Soul Society in many ways. Ichigo has human and Hollow powers, and Yoruichi has her own unique abilities. Their combined strength would be a force to be reckoned with. This might make the Gotei 13 more cautious about dealing with them. They could also inspire a new generation of shinigami to be more open - minded about relationships between different races, like humans and shinigami. Which in turn could lead to new power blocs forming within Soul Society.
Well, it could be about Ichigo facing challenges in the Shinigami Academy. Maybe he has trouble with the combat training or making friends at first. He might also discover some hidden secrets within the academy.
One common theme is redemption. Ichigo might go back in time to fix his past mistakes, like not being able to save someone. Another theme is power - up. Since he has the knowledge of the future, he can train differently in the past and gain stronger powers. Also, relationship repair is a theme. He could go back to mend broken relationships with his friends or family.