The students would be in awe. Percy's heroic deeds would make him a star among the students. They would be eager to learn from him. Thalia's cool and powerful aura would intimidate some but also draw others. Nico's dark and mysterious nature would fascinate the more adventurous students. Some might be scared at first, but overall, they would be excited to have such different and powerful teachers.
The students would be very curious. They'd probably be fascinated by his magic and his strange accent. Some might be a bit skeptical at first, especially the more practical - minded students. But overall, they'd be eager to learn from him.
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.