In the 'cj skuse fantastic fiction', CJ Skuse is likely the person who wrote it. They might be a relatively unknown author trying to make a name in the world of fantastic fiction. They could have a unique writing style that sets their work apart, with a focus on elements like complex characters and intricate plotlines within the framework of the fantastic genre.
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.