A Destiny 2 and Mass Effect crossover fanfic would be cool. The Guardians could interact with the various alien species in the Mass Effect universe. They could exchange knowledge about their different forms of space travel and combat tactics. For example, the Guardians could show the Mass Effect characters how to use their Light abilities in battle.
One idea could be a story where a group of Destiny guardians somehow end up in the Hive's territory and have to fight the Taken while also trying to understand the Hive's motives. They could form an uneasy alliance with some Hive members who also see the Taken as a threat.
One idea could be to cross Naruto with another popular anime like One Piece. Naruto characters could end up on the Grand Line, facing pirates and searching for the One Piece while using their ninja skills. Another idea is to cross it with a fantasy series like Harry Potter. Picture Naruto and his friends attending Hogwarts and learning magic alongside their ninja training. Or perhaps a crossover with the DC Universe, where Naruto characters gain superpowers similar to the DC heroes and fight against villains in a new, urban setting.
One idea could be having the Guardians from Destiny team up with the Jedi in Star Wars. The Guardians' unique abilities with their Light powers could interact in interesting ways with the Force used by the Jedi. Maybe they could face a common enemy that threatens both their universes, like a powerful Sith who has somehow gained access to the Darkness from Destiny.
One idea could be a group of Guardians from Destiny being transported to the Star Wars universe. They could team up with the Jedi to fight against the Sith and the Darkness that threatens both universes. Maybe they would introduce their advanced weaponry and abilities to the Star Wars characters.
Another plot could involve a shared enemy that exists in both universes. The combined forces of Mass Effect races and Destiny Guardians have to figure out how to defeat this enemy. They would need to overcome their differences in culture and combat styles to be successful.
One idea could be a crossover with another mecha anime like Macross. The characters from Gundam Seed Destiny could find themselves in the middle of a space battle in the Macross universe, having to adapt to the different technology and combat styles. For example, they might encounter the transforming Valkyrie mechs and have to figure out how to fight against them or even team up with the Macross pilots.
The combination of different universes. In a Destiny RWBY crossover, you get to see the high - tech and space - faring elements of Destiny meet the more medieval - like, yet also magical world of RWBY. For example, Destiny's guns and supers against RWBY's weapons and semblances.
A cool plot could be that the symbiote from Spiderman's world somehow gets linked to a Hive entity in the Destiny universe. This causes chaos as the combined powers create a super - powerful and evil being. Spiderman has to team up with a Warlock to find a way to separate the two and stop this new threat. The Warlock uses their knowledge of the Darkness and the Light, while Spiderman uses his physical abilities.
One idea could be a crossover between WWE and a popular superhero universe. For example, having WWE superstars team up with superheroes to fight a common enemy. Another could be a crossover with a fantasy world like Middle - earth, where the WWE wrestlers take on the roles of warriors in that world. Or perhaps a crossover with a post - apocalyptic setting where they have to fight for survival in a desolate world.
One idea could be a crossover with Supergirl. They could team up to fight a common enemy like Lex Luthor who has some new, devious plan that threatens both Gotham and Metropolis. Another idea is a crossover with the Arrow. The two vigilantes could exchange fighting techniques and learn from each other's experiences in protecting their respective cities.