One interesting plot could be that the heroes from The Legend of Zelda, like Link, find themselves in the world of RWBY. Link might have to team up with Ruby and her friends to fight a new common enemy that is a fusion of the dark forces from both universes. For example, Ganon's magic combines with Grimm energy to create a super - powerful and menacing foe.
Another interesting pairing could be Ganon and Salem. Both are powerful villains in their respective universes. They could form an alliance in the crossover fanfiction. Ganon's brute strength and dark magic combined with Salem's cunning and ability to manipulate would create a truly terrifying force. And the heroes from both worlds would have to work together to stop them.
Maybe Zelda herself could be transported to the Avengers universe. With her wisdom and magic, she could assist the Avengers in different ways. She could use her magic to heal the wounded Avengers or help Tony Stark understand some ancient technology that has similarities to her own world's tech. She could also provide strategic advice based on her experience dealing with Ganon in her own realm.
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 great RWBY x Legend of Zelda fanfiction is 'The Huntress in Hyrule'. It combines the action - packed world of RWBY with the magical realm of Zelda. The main character from RWBY is transported to Hyrule and has to face the challenges there while also using her unique skills. Another interesting one is 'Link and the Huntsmen'. It focuses on a crossover adventure where Link teams up with the RWBY characters to defeat a common enemy that threatens both their worlds.
Some fanfictions might explore the idea of the Triforce in the RWBY universe. Suppose the Triforce represents a powerful force that could either help or harm Remnant. The characters from both worlds would be drawn to it. The Zelda characters, with their knowledge of the Triforce, would have to work with RWBY's Huntsmen and Huntresses to protect it from falling into the wrong hands. There could also be a situation where Zelda's dungeons are reimagined in the RWBY world, and the RWBY teams have to go through them to achieve a certain goal.
Another one could be Weiss and Zelda. Weiss, with her noble upbringing, might find common ground with Zelda, who is also a princess. They could bond over their leadership skills and the need to protect their respective worlds. In fanfiction, they might team up to face a great threat that endangers both Remnant and Hyrule.
One more theme is the exploration of different moralities. The relatively simple good - vs - evil in Hyrule is contrasted with the more complex moral landscape of the DC Universe. This can lead to some interesting internal struggles for the characters as they navigate these different moral frameworks and try to figure out who the real enemies are and who can be trusted.
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.
It could be about Link ending up in Equestria and teaming up with Twilight Sparkle to fight a new evil that threatens both their worlds. Maybe Ganondorf has found a way to enter Equestria and is causing chaos, and Link uses his combat skills while Twilight uses her magic to drive him out.