One idea could be that Naruto and Link swap worlds. Naruto finds himself in Hyrule and has to figure out how to use the Master Sword while Link ends up in the Ninja world and tries to learn chakra control and ninjutsu. Another idea is a combined quest where characters from both universes team up to defeat a common enemy, like a powerful dark sorcerer who is causing chaos in both the Elemental Nations and Hyrule.
One idea could be that Mario and Link team up to save both the Mushroom Kingdom and Hyrule from a common enemy. Maybe a powerful dark wizard has found a way to merge the two worlds in a chaotic way, and they have to use their unique skills to restore order. Mario's jumping and power - ups combined with Link's swordsmanship and item - using abilities would make for an exciting adventure.
One idea could be that Link, from Legend of Zelda, somehow gets transported to the Naruto universe. He might initially be mistaken for a strange shinobi with his unique green tunic and hat. Link could use his combat skills, like swordsmanship and shield defense, to team up with Naruto and his friends against common enemies, such as the Akatsuki who are after powerful artifacts. Maybe the Ocarina of Time has some sort of power that the Akatsuki wants, and Link has to protect it while in this new world.
One idea could be that Link, the hero from Legend of Zelda, somehow gets transported to the world of MLP. He might team up with Twilight Sparkle to fight against a common enemy that threatens both their worlds. Maybe Ganon has found a way to corrupt the magic in Equestria, and Link's combat skills along with Twilight's magic knowledge are needed to stop him.
Another concept could be that some of the magical creatures from Harry Potter end up in the Zelda world. Hippogriffs could be used as a form of transportation for Link and his allies. And the house - elves could have an interesting role, perhaps they help out in the various villages in the Zelda world, using their magic to clean up and cook, while also getting a taste of freedom in this new world.
One idea could be Link crossing over into a modern world. He'd be confused by the technology like cars and cell phones. Another could be Link teaming up with a character from another game, like Mario. They could combine their skills to defeat a common enemy.
One idea could be a crossover with the Final Fantasy series. Link could meet characters like Cloud and they could team up to fight a new, powerful enemy that threatens both their worlds. Maybe the magic systems of both universes get combined in an unexpected way.
Another idea is a fusion of their powers. Maybe Link could gain some of Naruto's chakra and use it in a unique way. He could infuse his sword with chakra to make it stronger or perform new combat moves. And Naruto could learn some of Link's techniques, like using the bow and arrow more effectively in his own world.
One idea could be a Naruto and One Piece crossover. Naruto and Luffy could meet and have to team up to defeat a common enemy that threatens both their worlds. Maybe a powerful dark force that can manipulate the sea and the land.
Some great Legend of Zelda crossover fanfiction concepts include a crossover with the Sonic the Hedgehog series. Link could be racing through the Green Hills Zone on Epona. A crossover with the Super Mario Bros. universe is also a fun idea. Link and Mario could join forces to rescue Princess Zelda and Princess Peach from the clutches of their respective villains. Additionally, a crossover with the Kingdom Hearts series would be epic. Link could interact with Sora and the other Keyblade wielders, exploring different Disney and Zelda worlds together.
One interesting storyline could be where Naruto characters are teleported to the world of Zelda. Naruto, with his determination and never - give - up attitude, might take on the role of a hero in the Zelda world. He could use his shadow clones to solve puzzles or fight off hordes of Bokoblins. Another could be Link getting the ability to use chakra, which would completely change the way he battles enemies. He could use ninjutsu techniques along with his swordsmanship, creating a unique combat style.