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.
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.
There could be a group of anti - hybrid fanatics. They believe that the existence of a Naruto - Ichigo descendant is an abomination that goes against the natural order of both worlds. They form a secret society and start causing chaos, trying to eliminate the descendant. Their leader could be a former ninja who lost his family in a war and blames the mixing of powers for all the world's problems. They would be a complex antagonist as they have their own warped ideology to drive their actions.
In a fanfiction battle between Ichigo and Naruto, it's really hard to say who would win. Ichigo has his powerful Zanpakuto and Hollow powers. He can move at extremely high speeds and has devastating attacks. Naruto, on the other hand, has the Nine - Tails' chakra and his Rasengan and other jutsu. If Ichigo can quickly close the distance and land a powerful blow, he might win. But Naruto is very good at adapting in battle and could potentially use his clones and other tactics to outmaneuver Ichigo. It could go either way depending on how the writer of the fanfiction wants to portray the fight.