Well, first off, Naruto's physical abilities would be on a whole new level. His strength would be enough to lift and throw huge objects with ease, much like the Ghost Rider can. His speed would be enhanced so that he could move faster than the eye can see. In terms of his abilities, the transformation into the Ghost Rider would likely give him new ways to sense enemies. The hellfire would not only be a weapon but also a tool for detection. Naruto's values might also be challenged. He has always been about protecting the weak and bringing peace, but the Ghost Rider's nature of vengeance could conflict with that. However, he could also use the new powers to better protect his village and those he loves. For example, the hellfire could be used to create barriers to protect against attacks, and his newfound strength could be used to defend against powerful enemies that his normal ninja skills might not be able to handle.
Physically, Naruto would likely gain the characteristic features of a Sekirei. This could include wings, different colored eyes, or some sort of unique markings on his body. His fighting style would also change. Instead of relying solely on ninjutsu and taijutsu, he would start to use Sekirei - like abilities such as energy blasts or enhanced speed and agility.
One major change would be in Naruto's understanding of sacrifice. Itachi sacrificed a lot for the village, including his own reputation. Naruto, as his apprentice, would be exposed to this concept on a deeper level. He would learn that sometimes doing the right thing means making personal sacrifices. This would add a new layer to Naruto's character. He would not only be the loud, determined ninja but also someone who could make tough choices for the greater good, like Itachi did.
He'd likely become more of an enigma. His friends might find it hard to relate to him as his powers would be so different. He could become more solitary, like a dragon guarding its hoard, but also more powerful and feared.
His relationship with Sasuke would be very different. Sasuke might be more cautious around Naruto, seeing him as an even greater force. But at the same time, he would also be intrigued by Naruto's new power and might seek to understand it better, which could lead to a new level of cooperation between them.
Maybe Naruto discovers an ancient artifact in the Naruto world that has a connection to the Ghost Rider. When he touches it, he becomes the Ghost Rider. Now he has to balance his normal ninja duties with this new, fiery power. He could use the Ghost Rider's abilities to fight new threats that are emerging in the shinobi world, like a group of demons that the normal ninja techniques are ineffective against.
Imagine that there's a hidden organization in the Naruto world that has been secretly researching the power of the Ghost Rider. They capture Naruto and try to transfer the Ghost Rider's power into one of their own. But Naruto somehow manages to turn the tables and not only gains the power but also uses it to expose the organization's evil plans. He then uses his new - found Ghost Rider powers, combined with his ninja skills, to take on the leaders of the organization who are themselves powerful ninjas with dark intentions.
It would be really cool. Naruto would probably have a flaming skull and ride a demonic motorcycle while using his ninja skills. Maybe he'd use Rasengan with the power of the Ghost Rider's hellfire.
Well, if Naruto had Ghost Rider powers, his combat style would be completely transformed. He could use the Penance Stare, which would make his enemies face their sins. In the Naruto world, this could be a huge advantage against villains who have a lot of blood on their hands. For example, against Orochimaru, the Penance Stare might make him relive all the cruel experiments he's done. It would also add a new level of intimidation to Naruto. His already strong willpower combined with the Ghost Rider's power would make him an even more formidable opponent. And his movement would be enhanced, with the ability to ride on his flaming motorcycle, which would be a really cool addition to the Naruto universe.
Well, Naruto has his Nine - Tails chakra mode. If he combined that with the Ghost Rider's power, he could have a super - charged form. The Nine - Tails' chakra could fuel the Ghost Rider's flames, making them hotter and more destructive. And the Ghost Rider's ability to sense evil could help Naruto identify hidden threats in the ninja villages.
His relationships with his friends could change. Some might be afraid of him when they see the power of the Ghost Rider in him. But others, like Sasuke, could see it as a new strength to be reckoned with. Naruto would have to work hard to maintain his bonds while also exploring his new abilities.