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.
To build a story around a brand's first NFT drop, you could look at the brand's history and heritage. Find elements from there that can be woven into the story. Maybe it's a revival of a classic design or a continuation of a forgotten storyline. Also, make sure the story has a clear beginning, middle, and end to keep it coherent and interesting for potential buyers.
It could mean a story that has no end and when you 'turn around' it, perhaps implies looking at it from different perspectives but still it goes on without conclusion.