The voice of a story in English usually refers to the style or tone in which the story is told. It could be serious, humorous, or something in between.
I would recommend 'The Adventures of Sherlock Holmes'. The stories are full of mystery and intrigue. The characters are vividly described, and the plot twists keep you hooked. The English voice for this, if you can find a good audiobook version, really brings the Victorian London setting to life.
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.