Another theme is the exploration of different worlds. The Naruto universe is very different from the Bleach universe. Fanfics often explore how characters react when they are exposed to the new environment, rules and cultures of the other universe. For instance, a Soul Reaper might be shocked by the idea of chakra in the Naruto world and try to understand it.
One common theme is power - up. In many naruto and bleach fanfiction, characters from one series gain new powers or abilities when they interact with the other series. For example, Naruto might learn some Shinigami techniques in a fanfic. Another theme is friendship. Since both series value friendship highly, fanfictions often explore new friendships between characters from Naruto and Bleach, like Naruto and Ichigo becoming close allies.
One common theme is power. Since both Naruto and Bleach have characters with unique and powerful abilities, fanfictions often explore how these powers interact when the characters meet. For example, how Naruto's Rasengan would compare to Ichigo's Getsuga Tensho.
Naruto would probably befriend Ichigo right away. They both have a strong sense of justice and a desire to protect their friends. Sasuke, on the other hand, might be more aloof at first. He could be intrigued by Urahara Kisuke's mysterious nature. Naruto would likely get along well with Orihime too, as she has a kind heart. Sasuke might have a more competitive relationship with Byakuya, seeing his power and discipline.
In most cases, if Naruto dies in a Bleach fanfiction, it's likely a crossover event. His death could potentially disrupt the balance of power in the Bleach universe. For example, if his death is caused by a powerful Bleach villain, it might send shockwaves through the Soul Society. Shinigamis may start to question their own safety and the security of their realm. Also, his friends from the Naruto world might try to seek revenge in the Bleach universe, leading to all kinds of chaos and new storylines.
Well, friendship and rivalry are often seen in these fanfictions. The Bleach captains and Naruto characters may form unexpected friendships or intense rivalries. Also, the exploration of different power systems is a big theme. How would a Naruto character react to a Bleach captain's zanpakuto? And vice versa. There's also the theme of redemption in some cases, where a character from one universe helps a character from the other to overcome their past mistakes.
One common theme could be power - level comparisons. Since Naruto and Bleach both have complex power systems, a fanfic might explore how Yamamoto's power from Bleach compares to the various powers in the Naruto universe.
The combination of two different and popular anime universes. Naruto has its own set of unique powers like ninjutsu and the chakra system, while Bleach has spiritual powers and zanpakuto. When you mix them in a fanfiction where a character is godlike, it creates a whole new set of possibilities for epic battles and storylines.
The most immediate consequence could be a rift between Naruto and the Bleach characters. They might become enemies and start fighting. For example, Ichigo and his friends could see Naruto as a threat and try to stop him.
One interesting Bleach and Naruto fanfiction could be a crossover where the characters from both universes team up to fight a common enemy. For example, Naruto's ninja skills combined with Ichigo's Soul Reaper powers would make for an exciting adventure.