Perhaps it could have a power of transformation. Not just in terms of its physical form, but also in how it affects Naruto. It could transform Naruto into a more spiritual - like being for a short time, granting him enhanced senses and the ability to interact with spiritual realms, which would be a very cool addition to his abilities in the fanfic.
He could possess the power of the Rasengan. Yoruichi could potentially use it in different forms, like a long - range Rasengan blast or a more concentrated, close - range version for melee combat. And maybe Naruto's chakra nature could also be incorporated, allowing Yoruichi to use wind - based attacks more effectively.
In such a fanfic, Naruto would likely face a whole new set of challenges. The zanpakuto has its own spiritual and combat mechanics that are different from Naruto's ninja training. He would have to learn to communicate with the spirit of the zanpakuto, just as Shunsui does in Bleach. This could lead to some character - building moments for Naruto. In battles, he could use the zanpakuto's abilities to enhance his already formidable ninja skills. For instance, he might use the zanpakuto's slashing attacks in combination with his Rasengan, creating a more powerful and unique attack. Also, the fanfic could explore how the other characters in the Naruto universe react to Naruto having this foreign weapon. Some might be skeptical, while others might see it as a new hope in their fight against stronger enemies.
He could have his Rasengan - like power. Maybe the wielder could call upon a spirit - version of the Rasengan to attack opponents. It would be a powerful and concentrated blast of energy.
It could be really cool. Naruto would likely start by being confused about the Zanpakuto. He'd try to figure out how it works in a world where he's used to chakra. Maybe he'd initially struggle to even draw the sword properly. But as he gets to know it, he'd start to discover its powers. For example, he might use the Zanpakuto's abilities in combat against his ninja enemies in a way that surprises them. He could also form a bond with the Zanpakuto, similar to how Shunsui does in Bleach.
I think Naruto would be a likely candidate. He has always been eager to learn new powers and has a great capacity for growth. His determination and strong will would serve him well in the process of becoming a Zanpakuto master. He would face the challenges head - on and use his unique skills, like his shadow clones, to practice and master the Zanpakuto techniques.
The zanpakuto could have the power to breathe fire, just like a dragon. This would add a new offensive ability to Naruto's arsenal. He could use it in combination with his existing jutsu, like sending out a stream of fire while using his shadow clones to surround the enemy.
Maybe a zanpakuto with the power to heal. Naruto is all about protecting his friends and village. So a zanpakuto that can heal wounds during battle would be very useful. It could also have a secondary ability to boost the chakra of his allies. This would fit with Naruto's selfless nature.
Well, a 'naruto zanpakuto fanfic' could be about many things. It could be a story where Naruto discovers a zanpakuto and has to learn how to use it in his world. Maybe he meets characters from 'Bleach' who help him understand the power of the zanpakuto. Or perhaps it's a completely alternate universe where all the 'Naruto' characters are part of the 'Bleach' world and use zanpakuto as their main weapons. It's really up to the creativity of the fanfic writer.
Since Naruto is full of energy, the Zanpakuto could have a constantly vibrating or pulsating appearance. The scabbard could be orange, like Naruto's jumpsuit. And the guard of the sword could be shaped like Naruto's hand with a Rasengan formed in it. This would be a unique and eye - catching design that would clearly show the connection between Naruto and the Zanpakuto.
The powers could be related to the elements. For example, if Naruto had a Zanpakuto bloodline, his Zanpakuto might be able to control fire in a more refined way than his normal jutsu, like creating intense blue - white flames that can cut through anything.