Shikamaru could be an unexpected but interesting addition. His intelligence and strategic thinking would be invaluable for the team. He could plan out their missions and come up with solutions to difficult situations. Alongside Shizune, they would form a diverse team with different skills and abilities that would make for an exciting fanfiction story.
One possibility could be Sakura. Since Sakura is also a student of Tsunade in the original series, she would fit well in the team. Her medical skills and combat abilities would complement Shizune's. Another member could be Ino. Ino has her own unique skills in mind - transfer jutsu which could be useful in different situations during their missions.
The fanfiction might focus on the relationship within the team. Shizune could be in a constant struggle to live up to her mother Tsunade's reputation. The team would support her in this journey. They could also have some interesting interactions with other characters from the Naruto series. For example, they might encounter Naruto and his friends and collaborate on a mission that requires both their unique skills.
There could be a character who has a disability in the ninja world, like being partially blind but having an amazing sense of hearing or smell. Naruto would see their potential and include them in the team. Another member could be a former criminal's child who is trying to make a name for themselves in a positive way. And there could be a super - intelligent ninja who is great at strategy but lacks in practical combat experience, and Naruto would help them gain that experience.
Kurenai might be a good sensei for Naruto's different team. Her expertise in genjutsu would be valuable. She could help the team develop their skills in this area, especially if the new team members have some potential in genjutsu. Kurenai is also very perceptive, which would be great for guiding Naruto and his new teammates through difficult situations.
It could be some of the younger ninjas from the village who look up to Naruto. Maybe a young genin who has a special ability with earth jutsu, and another who is really good at stealth but lacks confidence. Naruto would then help them grow.
In many 'Naruto Shizune OC Team' fanfictions, the theme of loyalty stands out. The OC shows loyalty to Shizune and the team, and in return, they receive loyalty from their comrades. Additionally, the exploration of different ninja techniques and how the OC can contribute to the team with their unique skills is also a frequent theme.
It could be a rogue ninja from a rival village. This ninja has a personal vendetta against Konoha and specifically targets Team 10 because of Naruto's presence. He might be jealous of Naruto's growing power and fame and wants to prove himself by defeating the team.
One possible Jounin Sensei of Team 10 in Naruto fanfiction could be Shikamaru's father, Shikaku Nara. He was a highly intelligent shinobi and his strategic mind could be a great asset in training the members of Team 10.
One possibility could be Boruto as a new - age Naruto - like character. Sarada, with her Sharingan and Uchiha heritage, could be another member, similar to Sasuke. And for the third member, maybe a new character like a young ninja from a small and previously unrecognized clan who has a unique chakra ability. This new character could bring in fresh dynamics to the team.
It could be a rogue ninja from a neighboring village who is trying to steal some of Konoha's secrets. This ninja might target Konohamaru team because they are young and seem like an easy target, but they underestimate their skills and the protection they have from Naruto.
Lee would probably be Naruto's closest ally. They both have a strong will and are not afraid to face challenges head - on. They could bond over their mutual desire to become stronger and prove themselves. Lee's enthusiasm for taijutsu might inspire Naruto to improve his own physical combat skills, and Naruto could in turn teach Lee some of his unorthodox ninja techniques.