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.
The following are some recommended novels about girls who become girls and remarry:
1. After Swapping Bodies with the Demon Lord Author: Gan Li
2. After Wearing Each Other's Body with the Opponent Author: Banquet of Wuhe
3. Daily Life with the Big Villain Author: Hideki Matsuki
4. After I Divorced, I Interdressed with a Scumbag. Author: Watermelon Nun
5. " The Woman Destined to Be an Official " Author: Chen Bing
These novels were all based on the ancient language, telling the story of the female protagonist and the male protagonist's soul swapping. They cover different plots and characters, suitable for readers who like ancient romance.