Perhaps in a fanfic, Naruto travels to a different realm where the spirits of Zangetsu and Hyourinmaru exist. He has to pass certain trials and challenges set by the spirits themselves. If he can prove himself worthy, they decide to bond with him and become his weapons. This would involve Naruto showing his courage, determination, and his ability to use their powers for good rather than for selfish reasons.
Yes, in fanfic, Naruto can have Zangetsu and Hyourinmaru. It would be an interesting concept. Zangetsu is from Bleach and Hyourinmaru as well. If Naruto had them, his combat abilities would be greatly enhanced. He could use Zangetsu's unique sword forms and Hyourinmaru's ice - based powers in combination with his own ninja skills. This would make for some really cool fight scenes against tough opponents like Madara or Kaguya.
Hyourinmaru could be a key to unlocking a hidden power within a character. For instance, a young ninja discovers an old scroll that mentions Hyourinmaru. As they study it, they find that it holds the secret to a new form of chakra control related to ice. This then gives them an edge in combat and in their journey to become a stronger ninja.
Perhaps in this fanfiction, Naruto is given White Zangetsu as a gift from a mysterious figure. With it, he discovers new powers and abilities. He might have to train hard to master it, and in the process, he could face challenges not only from his own world but also from forces that are attracted to the power of White Zangetsu. This could lead to new alliances and enemies for Naruto, completely changing the dynamics of the Naruto universe.
He could find it during one of his missions. Maybe he's exploring an ancient ruin and stumbles upon the sword. It could be in a hidden chamber protected by some traps that Naruto has to overcome using his skills and wits.
One possible plot could be that Naruto somehow ends up in the Soul Society. There, he discovers Hyourinmaru. Maybe through some strange magic or accident, he forms a bond with it. He then has to learn to control Hyourinmaru's powers, which are very different from his chakra - based powers. He might face challenges from the Soul Reapers who initially don't trust him with such a powerful zanpakuto.
He could find it during one of his missions. Maybe he's exploring an ancient ruin and stumbles upon the lightsaber. It could be in a chest or just lying there, and Naruto, being curious, picks it up.
Maybe through some kind of magical encounter. For instance, he could stumble upon a portal that leads to a world where the Keyblade exists and be chosen by it. It could be that his strong will and desire to protect his friends are what draw the Keyblade to him.
It could be really interesting. Naruto is known for his strong will and determination. If he had Zangetsu, he would likely try to master it quickly. Since Zangetsu has a mind of its own in the Bleach series, there could be some fun interactions between Naruto and the sword spirit. He might even use Zangetsu to cut through some of the toughest jutsu barriers or opponents that he couldn't defeat with his normal techniques.
Another option is for a ninja to create a new jutsu inspired by Hyourinmaru. They could have seen the weapon in a vision or a dream and then use their chakra to replicate its ice - based powers. This jutsu could then be used in battles against powerful enemies, making the character stand out in the Naruto fanfiction world.
Yes, there are likely fanfictions out there with this concept. The Naruto fandom is vast and creative, and crossovers or unique concepts like Naruto having White Zangetsu are not unheard of. You can start by searching on popular fanfiction websites.