In 'team 7 left sakura fanfiction', Sakura is the main focus. However, Team 7 members Naruto, Sasuke, and Kakashi are crucial too. Naruto might be conflicted because he values Sakura as a friend but has to follow the group's decision. Sasuke may be more cold - hearted about it, which could add to the drama. Kakashi, being the experienced one, his leadership and the reasons behind leaving Sakura can be explored. There could also be other supporting characters like Ino, Sakura's friend, who could comfort her or help her in some way after she's been left.
Sakura is the central character in this fanfiction as she is the one being left. Naruto and Sasuke from Team 7 play important roles as well. Naruto's character could bring in the element of his loyalty and how he might struggle with the decision to leave Sakura. Sasuke, with his brooding nature, could have his own reasons for going along with leaving Sakura. Kakashi, as the mentor, his decision to leave Sakura could be influenced by his view of her abilities or some overarching mission goal.
Obviously, Sakura would be one of the main characters. Since it's about Team 7 leaving her, the members of Team 7 like Naruto, Sasuke, and Kakashi could also be considered main characters, even if they are the ones leaving. Their actions and decisions are what drive the story of Sakura being left.