Well, Gojo could be a super powerful outsider. Maybe he comes to the Naruto world to study its unique chakra system. His Infinity ability would be a game - changer. He could use it to easily deflect most ninjutsu attacks. And his Six Eyes could help him detect hidden enemies or traps that normal shinobi might miss.
Gojo's power of the Six Eyes could help him detect magic in ways the Fairy Tail wizards can't. For example, he could see the flow of magic energy in a battle and predict his opponents' moves better.
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.
This was the level classification in the fantasy epic fantasy novel," All-rounded Wizards of the Other World." I suggest that you read this novel and experience the life of the protagonist, who takes in underlings, surrenders his magical pets, and fights against powerful enemies. I hope you like my recommendation.😗