I think it would be a very close call. Ichigo has the power to cut through almost anything with his Zanpakuto, and his Hollow form gives him a huge boost in strength and speed. Naruto has his own arsenal of powerful jutsus, and his ability to draw on the Nine - Tails' chakra makes him extremely formidable. If we consider their mental strength as well, both are very determined. Ichigo has his resolve to protect his friends and the Soul Society, while Naruto has his dream of becoming Hokage and bringing peace to the Ninja World. In the end, it might come down to who has the better strategy at a given moment in the fanfiction.
It's really hard to say who would be stronger. Tsuna has his powerful Dying Will Mode which gives him enhanced strength, speed, and combat abilities. However, Ichigo has his Bankai which is extremely powerful as well. If we consider the environment and the nature of the threat they face, it could change things. For example, if the enemy is more spiritual in nature, Ichigo might have the upper hand as he is more experienced in dealing with spiritual beings. But if it's a more physical battle, Tsuna's training in hand - to - hand combat could make him a formidable opponent.
It's hard to say. Ichigo has his Soul Reaper powers which are incredibly strong. He can cut through almost anything with his Zanpakuto. But Izuku has One For All which gives him superhuman strength, speed, and the ability to jump really high. So it depends on the situation.
In fanfiction, Ichigo might get stronger through unique training regimens. For example, he could be trained by a long - lost powerful Shinigami. This Shinigami might have ancient techniques that are not known to the regular Soul Society. Ichigo would have to endure rigorous physical and spiritual training, pushing his limits far beyond what he thought possible.
Mentors play a big role too. In fanfiction, a new mentor could be an ancient being from a different dimension. This mentor would guide Ichigo in mastering new forms of combat and spiritual control. They could teach him how to manipulate his spiritual pressure in ways he never thought of before, which would make him stronger.
In addition to Ichigo and Naruto, other characters could also be involved. For example, some of Ichigo's friends like Uryu or Chad might make appearances. On Naruto's side, characters like Sakura or Kakashi could also interact with Ichigo in the story. They could be curious about this strange new person who has come to help Naruto or be a bit suspicious of his intentions.
Maybe Naruto uses his shadow clone jutsu to surround Ichigo and keep him safe from any approaching threats. The clones can act as a first line of defense, alerting Naruto of any danger.
Well, on one hand, Hidan's immortality gives him an edge as he can keep coming back no matter how many times he's 'killed'. But Naruto is not just any opponent. Naruto has the power of the Nine - Tails and has trained with some of the greatest ninja. His speed, strength, and intelligence in battle are remarkable. He could potentially use his shadow clones to distract Hidan and then land a fatal blow. So, overall, Naruto has a greater chance of being the stronger in this fanfiction encounter.
Well, in this kind of fanfic, it's not so simple to decide who is stronger. Goku's power levels keep increasing exponentially as he reaches new super saiyan forms. He can destroy planets with his power. Naruto, though, has the ability to harness the power of the nine - tailed fox which is also extremely powerful. Moreover, Naruto has his own unique chakra - based attacks. If they were to fight, Goku might start off with an advantage due to his speed and power. But Naruto is a very quick learner and could adapt during the fight. Also, Naruto has his friends and allies that could potentially tip the balance in his favor in a more complex battle scenario.
Obviously, Naruto and Ichigo would be the main characters. Since it's a reincarnation fanfiction, they would be at the center of the story. But other characters from both universes could also be important. In the Naruto side, Sasuke might play a role as he has a strong connection with Naruto. From the Bleach side, Rukia could be involved as she was the one who turned Ichigo into a Soul Reaper. Their interactions with Naruto and Ichigo in this new reincarnation scenario would add depth to the story.