Well, one way this could work in a fanfiction is that Naruto could use Yuta's powers to enhance his combat abilities. Yuta has some really unique and powerful cursed energy techniques. Naruto might be able to combine his chakra with Yuta's powers, like using the Rasengan with Yuta's cursed energy for a super - powered attack. It could make for some really interesting battles against tough opponents like Madara or Kaguya.
It's hard to give an exact time as it depends on the manga's plot development. But typically, Yuta Okkotsu shows up when certain events and character arcs lead to his introduction.
Yuji Itadori is a high school student who gets involved in the world of curses and sorcery. He has unique abilities and embarks on dangerous adventures to protect others.
Not at all. Yuji Itadori's story doesn't end with his execution in the manga. There are many developments and challenges he faces, but execution isn't one of them.
Yuji Itadori survives till the end. The manga doesn't have his death as the final outcome. The story might have thrown challenges at him, but he manages to overcome them and remain alive.
If Naruto had Yuta's powers, his fighting style would be drastically different. He'd no longer rely solely on ninjutsu and taijutsu. He could use Yuta's cursed energy to create new types of attacks. For example, he might be able to send out waves of cursed energy like Yuta does, which could catch enemies off guard. This would make him a more versatile fighter and a greater threat to his enemies.
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.