One interesting concept could be the clash of different ideologies. In Warhammer 40k, there is a lot of grimdark and a strict hierarchy, while Star Trek is more about exploration and unity. So seeing how characters from both universes react to the other's values can be really engaging.
One interesting concept is the crossover with other popular sci - fi universes. For example, a crossover with Star Wars could have the Imperium of Man facing off against the Galactic Empire. Another concept could be the combination of different Warhammer 40k factions in unexpected ways within the fanfiction. Maybe the Space Marines teaming up with the Orks against a greater threat.
A common crossover is the appearance of Starfleet officers in the Warhammer 40k universe. They might be seen as strange and otherworldly beings. Their peaceful exploration ethos would be a sharp contrast to the constant warfare in 40k. For example, they could try to broker peace between warring factions in 40k, which would be a huge challenge given the nature of that universe.
Some interesting concepts are the different power sources. In Halo, we have things like plasma and fusion power, while Warhammer 40k has the Warp and its associated powers. How would these interact? Maybe a UNSC ship powered by a fusion reactor has to deal with the unpredictable effects of the Warp when it enters a region influenced by it. And then there's the concept of heroism. Spartans are known for their individual heroics, while in Warhammer 40k, heroism often comes with a heavy price and a lot of religious and ideological baggage. Combining these two views of heroism can make for some thought - provoking stories.
Some interesting concepts include the combination of the different power systems. In Halo, you have the MJOLNIR armor with its energy shields, and in Warhammer 40k, there are psykers with their psychic powers. Imagine a scenario where a Spartan with MJOLNIR armor has to face a Warhammer 40k psyker. How would their powers interact? Another concept is the cultural exchange between the two universes. The military hierarchies and honor codes in both settings could lead to some really complex and engaging storylines when combined.
One interesting concept is the mixing of different Star Trek series' characters. For example, seeing characters from The Original Series interact with those from Deep Space Nine. It creates unique dynamics as their different cultures and values collide. Another concept could be the introduction of new species that are a combination of species from different Star Trek universes. This can lead to all kinds of new storylines about how these new species fit into the existing galactic politics and relationships.
In Warhammer 40k Mass Effect crossover fanfiction, a great concept is the mixing of combat styles. The high - tech weaponry of Mass Effect, such as the Omni - tools and assault rifles, against the brutal and often primitive - looking weapons of Warhammer 40k. It would be fascinating to see how a Mass Effect squad would fare against a horde of Orks. Additionally, the concept of different cultures' beliefs is interesting. The religious fanaticism in Warhammer 40k and the more scientific - minded approach in Mass Effect could create some intense ideological clashes.
One interesting concept could be the evolution of the factions. For example, how the Space Marines might have developed new combat tactics or even new genetic enhancements. Another could be the exploration of new planets and the strange alien species that might be discovered. Also, the political intrigue within the Imperium could be a fascinating aspect, like the power struggles between different segments of the military or the Adeptus Terra.
Some interesting concepts in Warhammer 30k fanfiction include the loyalty and betrayal within the legions. There are stories that show how a single act of betrayal can have far - reaching consequences for an entire legion. The psykers in this setting also offer great potential for fanfiction. Their powers and how they are controlled or go out of control can be the focus of many stories. Additionally, the relationship between the Space Marines and the Mechanicum is another area that fanfiction often explores, with different takes on their cooperation and conflicts.
One interesting concept could be the interaction between the Federation in Star Trek and the Galactic Republic in Star Wars. For example, how would their different forms of government and ideologies clash or cooperate? Another concept might be the use of technology. Star Trek has the transporter and Star Wars has the hyperdrive. How would characters from each universe react to the other's technology? Also, the idea of Jedi and Vulcans interacting due to their shared emphasis on mental discipline is really cool.
The space battles are often the highlight. Warhammer 40k has huge fleets of gothic - looking ships armed with massive guns and torpedoes. Star Trek has its own sleek starships with advanced weaponry like photon torpedoes and phasers. In fanfiction, a large - scale battle between a Warhammer 40k imperial fleet and a Star Trek Federation fleet would be amazing. The different tactics, ship designs, and crew capabilities would all come into play. For instance, the hierarchical and often fanatical nature of the Warhammer 40k crews compared to the more diverse and diplomatic Star Trek crews would lead to very different decision - making processes during the battle.