Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
Fan Xian's performance in " Celebrating Years " had caused some of the audience's dissatisfaction and disgust. Some people thought that he was an extremely selfish, incompetent, but self-important person, and no matter what he did, the author could smoothly explain that he was in control. There were also people who felt disgusted by Fan Xian's flirting with other women and thought his behavior was annoying. In addition, Fan Xian had relationships with many women in the play, which made some of the audience suddenly not want to continue watching. However, there were also people who mentioned some of Fan Xian's positive characteristics in the play, such as his resourcefulness and influence. In short, Fan Xian's performance in " Celebrating Years " had aroused different emotions and evaluations from the audience.
It's hard to pinpoint exactly where Gojo is at any given time in the manga. His whereabouts change as the story progresses and different scenarios unfold. It could be in a supernatural realm, a mission site, or interacting with other characters.