Another interesting plot could be the discovery of a long - lost portal that connects the two universes. This leads to an exchange of knowledge and technology between the two. However, not everyone is happy about this union. There could be factions in both universes that oppose this new connection, fearing it will disrupt the balance of power. They then start a secret war to close the portal and end the exchange, leading to a complex web of intrigue and battles.
A plot could revolve around a hero from Warhammer finding themselves in the Warcraft universe and having to adapt to the different magic systems and cultures. They might have to learn about the ways of the Alliance and Horde while also trying to find a way back home. This could involve teaming up with local heroes like Thrall or Jaina Proudmoore and facing off against various threats.
One idea could be a crossover of the two universes' races in a battle for a powerful, ancient artifact. For example, the Orcs from Warcraft and the Orks from Warhammer could form an uneasy alliance against a common enemy like a powerful demon lord that threatens both worlds.
Well, an interesting plot could involve an OC who is a skilled artisan in the Warhammer world. This OC could be commissioned to create a powerful weapon, but during the process, they discover a dark secret about the materials or the person who commissioned it. Maybe an OC who is a diplomat trying to broker peace between two warring factions, but they face many obstacles and betrayals along the way.
A plot could involve the forces of Warhammer trying to harness the power of the Doom Slayer. They see his incredible combat abilities and want to use him in their battles. However, the Slayer has his own mission and is not easily swayed, leading to a conflict of interests and some intense battles.
One idea could be that the Annihilation Maker is a new weapon created by a mad tech - priest in the Warhammer universe. It starts to cause chaos as it has the power to disintegrate entire legions of enemy forces. But it also has a mind of its own and begins to target allies too.
A really interesting plot could revolve around the origin of the demons in both universes. The fanfiction could explore if there is a connection between the Chaos demons in Warhammer 40K and the demons in Doom. Maybe the Doom Slayer and a Warhammer 40K Inquisitor work together to uncover this mystery while fending off the never - ending waves of enemies.
One idea could be that Naruto characters are transported to the World of Warcraft universe. They could form alliances with different races like the Night Elves, with Naruto's ability to befriend others coming in handy. Another could be that the chakra system in Naruto somehow interacts with the magic in WoW, creating new and powerful spells.
One idea could be the Imperium of Man encountering the Citadel Council. The Imperium's strict dogma and military might would clash with the Council's more diplomatic approach. For example, the Space Marines might be seen as terrifying super - soldiers by the Mass Effect races.
One idea could be a crossover with Star Wars. Imagine the Imperium of Man encountering the Galactic Empire. The two totalitarian regimes could have some intense ideological battles and epic space battles as well.
How about a crossover with 'Final Fantasy'? The different job classes in Final Fantasy could be compared to the various character types in Warhammer Fantasy. For instance, the Black Mages in Final Fantasy could team up with the Warhammer Fantasy mages to cast powerful spells against a great evil. And the idea of having Warhammer Fantasy's Chaos forces corrupt some of the beautiful and idyllic worlds in Final Fantasy could create a really dark and engaging story.
Well, an interesting fanfic idea could involve an OC who is a half - elf. This OC has a natural affinity for beauty and art, which makes them a target for Slaanesh. However, they have a strong bond with their elven heritage that values purity and nature. So, they struggle between the temptations of Slaanesh and their own identity. Also, a story about an OC who is a gladiator in a Slaanesh - influenced arena. They have to fight not only for their life but also against the psychological warfare of Slaanesh's followers who try to convert them.
One idea could be a crossover where Naruto's world and the world of X - 23 from the X - Men collide. Maybe X - 23 is on a mission and accidentally ends up in the Hidden Leaf Village. She has to learn to adapt to this new place with its different culture and ninja ways. Naruto could be intrigued by her and her abilities, and they could team up to face a common enemy.