Well, Itadori's journey in the manga has been full of surprises. He's had to deal with curses, make difficult choices, and his relationships with other characters have evolved in complex ways. There have also been moments of great personal sacrifice and growth for him.
It could completely change the power dynamic in the story. Naruto with the Rinnegan would likely become almost invincible, making his battles much less challenging.
Itadori did indeed die in the manga. His death had a significant impact on the story and the other characters. It was a turning point that led to many new developments in the plot.
Itadori is quite powerful in the manga. His strength lies not only in his physical abilities but also in his determination and the unique powers he acquires along the way. He's able to face off against formidable opponents and come out on top more often than not.
If Azula had the Rinnegan in fanfiction, it would change her character arc significantly. She might start to view power in a different way. With the Rinnegan, she could potentially gain access to knowledge about different worlds, like the Naruto world. This new knowledge could either make her more power - hungry or cause her to have a change of heart and use her powers for more noble purposes. She could also use the Rinnegan's ability to revive the dead to bring back someone important in her life, like her mother perhaps, which would add a whole new layer of complexity to her story.