Perhaps his strength is superhuman. He could lift extremely heavy objects like boulders effortlessly, which would give him an edge in battles. For example, he could use these boulders as weapons against his foes.
His senses could also be highly developed. He might be able to sense danger from miles away, almost like a sixth sense. This would help him anticipate attacks and plan his strategies better.
As the story progresses, he could develop a stronger sense of responsibility. With his superhuman abilities, he realizes that he has a greater role to play in protecting his village or the world. He might face moral dilemmas on how to use his powers for good.
Naruto's character development with Super Saiyan abilities would be quite a journey. His growth as a character in the original Naruto series was based on his determination and his ability to never give up. With Super Saiyan powers, this determination would be amplified. He would see himself as having even more responsibility to protect those he loves and his village. The Super Saiyan transformation might also give him a new perspective on power. He may start to question the nature of power in the ninja world compared to the Saiyan way. This internal struggle would add depth to his character. Additionally, as he trains to master these new abilities, he would become more disciplined, which is a trait not always associated with his impulsive younger self. All in all, the Super Saiyan abilities would transform Naruto into a more complex and powerful version of himself.
Naruto would likely gain the ability to transform into a Super Saiyan - like state. His already formidable strength and speed would be enhanced exponentially. His Rasengan might become a Super Rasengan, with golden energy surrounding it. Sasuke could also gain Saiyan abilities. His Sharingan might combine with the Super Saiyan powers, allowing him to see even faster and predict his opponents' moves more accurately.
One common ability is the Sharingan. It's a very powerful ability from the Uchiha clan. Another could be some kind of elemental control like the ability to manipulate lightning better. Sometimes he might absorb the ability to heal quickly, which is quite useful in battles.
One potential ability is the creation of highly customized puppets. Naruto could use his knowledge of different ninja techniques to make puppets with special functions. For example, a puppet with the ability to perform Rasengan attacks. Another ability could be his quick - thinking in puppet combat. Since he's already good at adapting in battles, he could control puppets in a very fluid and strategic way.
He could potentially be a demon. Demons in the Naruto universe often have unique powers and appearances, and Naruto's connection to the Nine - Tails could be a starting point for such a transformation in fanfiction.
He could be a demon. In some fanfictions, Naruto might be reimagined as a powerful demon with unique abilities that are different from his normal human ninja skills.
Well, in a 'naruto last human fanfiction', it could potentially explore Naruto's character in a very different light. He might be on a journey to find out why he is the last human. It could involve him traveling through a world that has been destroyed, perhaps by some great war or a cataclysmic event, and along the way he discovers secrets about the past and tries to find a way to bring back humanity.
Naruto might gain superhuman strength like Kratos. He could easily break through solid rock or lift extremely heavy objects. His speed could also increase, allowing him to move so fast that enemies can barely see him. Maybe he could also have the ability to summon the blades of chaos, which he could use in combat in a unique way, like combining them with his kunai.
Naruto might gain the power of shikai and bankai. Shikai is the first release of a zanpakuto's power, and bankai is the ultimate form. Naruto, with his determination and strong will, would strive to master these forms. Shikai could give him new attacks and defenses, while bankai could make him an extremely powerful force. For example, his bankai could combine his ninjutsu skills with the zanpakuto's power in a unique and devastating way.