Maybe they both have a common enemy that forces them to team up and during their journey, they start to feel a strong bond that makes them suspect they might be related. They could then start to explore their pasts and find out that they have the same father or mother who was involved in some sort of cross - dimensional love story.
Well, Naruto has his Sage Mode which gives him enhanced senses and strength. If Ichigo and Naruto were brothers, Ichigo could potentially use Naruto's Sage Mode - like ability to sense spiritual and physical threats better. In return, Ichigo could share his ability to see and interact with spirits with Naruto. This would give Naruto an edge in battles where there are hidden spiritual enemies. And when Naruto uses his Rasengan, Ichigo could infuse it with his reiatsu, creating a super - powerful attack that could destroy even the toughest of enemies.
In fanfiction, Naruto and Ichigo could embark on an adventure to find a lost artifact. This artifact has the power to either destroy or save both their worlds. They would travel through different landscapes, from the hidden villages in Naruto's world to the Soul Society in Ichigo's world. Along the journey, they would encounter various characters who either try to help or hinder them. Their brotherly bond would be tested as they face difficult decisions on how to obtain the artifact and what to do with it once they have it.
In the fanfiction, their relationship might be based on mutual respect. Naruto, being a very determined character, would admire Ichigo's resolve to protect his friends and family. Ichigo, on the other hand, would see Naruto's never - give - up attitude as something inspiring. They could train together, with Naruto helping Ichigo with his physical strength and Ichigo guiding Naruto in spiritual awareness. Their brotherly bond could be forged through shared experiences like facing powerful foes and saving their respective worlds.
The story could start with Naruto and Ichigo being separated at birth due to some sort of prophecy or dark plot. They each grow up in their respective worlds, Naruto in Konoha and Ichigo in Karakura Town. One day, a strange event occurs that links their two worlds, and they finally meet. At first, they are skeptical of each other. However, as they start to train together, they realize they have a lot in common. For example, they both have a strong desire to protect their loved ones. They might combine their powers in unique ways. Naruto could use his shadow clones to distract enemies while Ichigo delivers a powerful Getsuga Tensho. Their story could be about them uniting their two worlds against a common, powerful foe that neither world could face alone.
Well, their relationship could be really interesting. Since Naruto is so full of energy and determination from the Naruto series, and Ichigo is brave and strong - willed from Bleach. As brothers, they might constantly compete with each other in terms of strength and skills. They would also be very protective of each other. Naruto's rasengan and Ichigo's Getsuga Tensho could be used in combined attacks during battles against powerful enemies.
Naruto is very outgoing and boisterous, while Ichigo can be a bit more reserved. As brothers, Naruto would probably be constantly trying to get Ichigo to open up more. Ichigo, in turn, would keep Naruto in check when he gets too carried away. Naruto's optimism would brighten Ichigo's more brooding moments, and Ichigo's calmness would help Naruto think more before acting.
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.
One idea could be that Ichigo and Naruto are brought together by some sort of interdimensional rift. They initially don't understand each other's powers but soon realize they share a common goal of protecting their friends and worlds. They could team up to fight a powerful enemy that threatens both their universes.
Yes, there are quite a few out there. Some explore the idea of Naruto being a big fan of Ichigo. They often create crossovers where Naruto might be inspired by Ichigo's fighting style or his sense of justice. For example, in some fanfics, Naruto tries to incorporate Ichigo's sword - fighting techniques into his own ninja moves.