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.
I'm not sure as the term 'azure veil' could be something very specific in a fictional or made - up context. It might be a symbol, a name of a place, or an object within that particular story.
The black veil in the story is a symbol of mystery and sin. It sets the minister apart from the rest of the community and makes others wonder about his secrets.
In the 'the long black veil story', the long black veil can be seen as a representation of the unknown. It shrouds the character who wears it, creating an aura of enigma. This not only piques the curiosity of the other characters in the story but also of the readers. It might be related to a character's guilt or shame, something they don't want to expose to the world. It also adds a layer of visual intrigue, as the black veil stands out and draws attention, making it a focal point that holds many possible interpretations within the context of the story.