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 Feng Family Cultivation novel was a martial arts cultivation novel written by the author, Half Pot of Ginger Water. The novel described the story of a student who transmigrated to become a member of the subdued beast Li Clan. It described his experiences on the path of cultivation. Although there was no specific plot or chapter information in the search results provided, it could be seen that this was a story about cultivation and family.
Some of the prehistoric novels contained elements such as the Cangli Clan, the Yue Jian Clan, and the Nine-Headed Clan. However, the search results didn't provide any clear information on which novels contained these elements, as well as their plots and story content. Therefore, he could not answer this question accurately.