Kakashi would be a great addition. His wisdom and combat skills could add depth to the story. He could act as a mentor figure, guiding Naruto and Sasuke through the strange situations they find themselves in due to the fox - related elements.
Jiraiya. He has a lot of knowledge about the supernatural, especially things related to spirits and beasts. He could help Naruto and Sasuke understand the nature of the fox in the fanfiction and perhaps even have some past experiences that are relevant to the situation they're facing.
Sakura. She could provide medical support and also add some emotional drama. Her relationship with Sasuke could be further explored in the context of the fox fanfiction, like how she reacts when Sasuke is in danger because of the fox - related events.
Sasuke from Naruto could be a great addition. His brooding nature and powerful ninja skills would contrast well with Musubi's more upbeat and energetic personality. Also, Konohamaru could be included. He looks up to Naruto and his presence could add some humor to the story as he tries to impress Naruto and Musubi.
Jiraiya could be a great addition. Since he was Pain's teacher, his presence could add a lot of depth to the story. He could offer insights into Pain's past and also help Naruto understand Pain better.
I think Hinata would be an interesting character to include. She has her own unrequited love for Naruto. Her presence could add some drama to the story as she sees Naruto getting closer to Ahri. Another good character could be Jiraiya. His lecherous yet knowledgeable self could provide some comical relief and also give some sage advice to Naruto and Ahri when they need it.
Sakura could be a great addition. She could be Hinata's best friend and give her advice on her relationship with Naruto. She might also be a bit jealous at first but then come to fully support them.
Sakura could be a great addition. She could provide medical support during their adventures or offer her combat skills when needed. Kakashi would also be a good choice. His wisdom and experience could guide Naruto and Princess Yuki in difficult situations.
Hinata could be included. Her gentle nature could have a positive impact on Inari, and she might be able to teach him some of her own ninja techniques. Shikamaru could also be part of it. His intelligence would be valuable in planning strategies, whether it's for defending the Land of Waves or dealing with other threats. Also, Tsunade, as she could offer her leadership and medical expertise if needed.
Definitely include Obito. His complex relationship with the Uchiha clan and his own history with the Anbu - like Akatsuki could create some interesting plot twists. Additionally, Kurenai could be added. She could be involved in a mission where she has to work with Itachi and Naruto. Her genjutsu skills might come in handy during a crucial part of the story. And don't forget about Rock Lee. His determination and unique fighting style could add some action - packed scenes to the fanfiction, especially if he gets involved in a mission with Itachi and Naruto.
Gaara should be included. Since he also has a tailed beast within him, he and female Naruto could share a special bond. They could exchange experiences about living with a powerful entity inside them. Shikamaru is another good character. His intelligence can be used to strategize when female Naruto faces challenges related to the Kyuubi. And Ino could be in the story as well. She might use her mind - reading abilities to help female Naruto understand the Kyuubi's thoughts and feelings better, which could be crucial in controlling its power.
Boruto is often a popular character in such fanfiction. Since he also has the Jougan, stories might focus on his training with Naruto to master this power. Their father - son relationship can be explored in new ways as they both deal with the implications of the Jougan.
Ino could be included. She and Sakura could have a bit of a friendly competition for Sasuke's attention at the start. But then as the story progresses, she could become one of Sakura's supporters in her relationship with Sasuke. Also, Kakashi as a teacher could play an important role, perhaps giving Sasuke and Sakura some wise advice about love and relationships.