The Scream was a novel written by Lu Xun. It was about a small figure who was oppressed by society. In desperation, he let out a cry to attract the attention of society and finally obtained freedom and dignity. This novel was known as a classic of modern Chinese literature for its strong ideology and artistry.
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.
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.