The Purple Blood Vine had many uses and effects. It can be used to treat gynecological diseases, such as irregular menstruation, menstrual cramps, amyostasia, etc. In addition, the Purple Blood Vine could also improve the symptoms of rheumatism, pain, numbness, and so on. It had the effects of promoting blood circulation and replenishing blood, regulating menstruation and relieving pain, relaxing muscles and collaterals, and so on. The Purple Blood Vine also had the effect of clearing away heat and detoxification. It could be used to treat diseases such as heat poisoning and colds. In short, the Purple Blood Vine was a Chinese medicinal herb with many medicinal values and effects.
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.