In fanfiction, Naruto jumping in front of his friends could be a heroic act. Maybe he's protecting them from an incoming attack. It shows his selfless nature, always ready to sacrifice for those he cares about.
One possible motivation could be his deep - seated longing for his parents. Naruto has always felt their absence and has craved their love and approval. Jumping in front of them could be his way of showing that he is worthy of being their son and that he can protect them, even if it's in a situation that defies the normal order of things. It's like he's trying to rewrite the past in a way, to be the hero for his parents that he has become for the village.
In the context of fanfiction, Naruto's jump could have some unexpected consequences. Maybe as he jumps in front, he discovers a new power within himself. This new power could be something that not only saves his friends but also changes the course of the battle. It could be a power related to his connection with the Nine - Tails or some other hidden ability that gets unlocked due to his strong will to protect his friends.
Another motive could be Naruto's loyalty to his friends and the village. If Obito is a threat to them, Naruto will put himself in danger to safeguard them. He has a strong bond with his comrades and the place he calls home. Jumping in front of Obito could be his way of showing that he will not let anyone harm what he holds dear, even if it means facing a powerful enemy like Obito.
One possible reason could be that Naruto is afraid of endangering his friends. He has many powerful enemies, and he might think that by staying away from his friends, they won't be targeted. For example, Orochimaru was always after Sasuke, and Naruto might fear that his closeness to Sasuke could put Sasuke in more danger.
In this fanfiction, Naruto, filled with new - found strength and determination, jumps in front of his parents. His parents, who have long been dead, look at him in shock and pride. Naruto stands tall, his eyes blazing with the will of fire. He tells them that he has come a long way, that he has faced countless enemies and hardships. He wants them to know that he is no longer the lonely, ostracized boy. His father, Minato, smiles and places a hand on Naruto's head, just as he did when Naruto was a baby. His mother, Kushina, hugs him tightly, her eyes wet with tears. Naruto then begins to tell them about his friends, his village, and how he has protected it all. He vows to continue to do so, with their love and support always in his heart.
Typically, Naruto is known for his deep love and loyalty towards his friends. Fanfiction that has Naruto hating his friends is probably a deviation from the traditional understanding of the character. It might be used to explore some extreme scenarios, like if he was under some sort of mind control or if there was a huge misunderstanding. But in the mainstream Naruto - themed fanfiction, this is not a common occurrence.
In this fanfiction scenario, Naruto and his friends would likely be extremely confused by Cell. Naruto might immediately jump into action, ready to fight. His friends, like Sasuke, would probably assess the situation carefully. Maybe Sakura would be a bit scared at first but then gather her courage. They would have to quickly figure out Cell's abilities, which are very different from the foes they usually face in their own ninja world.
Naruto's power might also be affected. If he was betrayed, he could lose the will to fight or train. He might even start to doubt his own purpose. This could lead to a decline in his abilities, which in turn could put the village at risk if he was its main protector.
In some fanfictions, Naruto protects his friends by using his new and improved jutsu. For example, he might develop a more powerful Rasengan to fend off stronger enemies. He also uses his quick thinking and ability to sense danger, which he has honed over time. His unwavering loyalty drives him to put himself in harm's way without hesitation, always being the first to jump into a fight when his friends are threatened.