If you like novels like the Enen Witch, I can recommend some similar works. For example," Mad Concubine: Wolf King's Strange Ways to Chase His Wife " and " Wolf King's Pet Princess Consort " were ancient romance novels similar to " Wolf King's Contracted Concubine." In addition, if you like novels about time travel, you can read The Fierce Wife Is in Power: Don't Think of Running Away, General, and My General's Wife Is Afraid. These novels all have wonderful plots and attractive writing styles. I hope you will like them.
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.