At the moment, it's unknown if Gojo will come back to life in the manga. The storyline could take various turns and surprises are common in manga. We'll just have to wait and see.
Sure, Gojo came back to life in the manga. It was a surprise for many fans and was handled in an interesting way. The author crafted a storyline that made his return plausible and engaging.
In a world full of curses, Gojo Satoru's love story might start at the Jujutsu High. There was a new student who was very talented. Gojo noticed her immediately. He became her mentor, guiding her in the ways of jujutsu. As time passed, their relationship changed. He found himself falling for her. They would often train together until sunset, and in those moments, their love quietly blossomed.
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.