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.
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.
One way to edit your life story is to think about the narrative arc. Just like in a book or a movie, your life should have a beginning, middle, and end. Highlight the turning points and how they changed you. Cut out the parts that are not relevant or that don't contribute to the overall message you want to convey. You might also want to add some foreshadowing or symbolism to make it more engaging.