A cool concept for Chaos Space Marine crossover fanfiction would be to cross them with the Halo universe. Imagine the Chaos Space Marines facing off against the Spartans. The technological differences between the two would make for some interesting battles. The Chaos Marines' warp - based powers and the Spartans' advanced armor and weaponry would be a great contrast. Also, a crossover with the Star Wars universe could be interesting. The Chaos Space Marines could interact with the Sith Lords, sharing their thirst for power and destruction.
One idea could be a crossover with the Warhammer 40K Imperium forces where a group of Chaos Space Marines infiltrate an Imperial stronghold. They could face off against Space Marines of the Ultramarines chapter, leading to intense battles and moral dilemmas for both sides. Another idea is a crossover with a fantasy setting like the Elder Scrolls. The Chaos Space Marines could find themselves in Tamriel, causing chaos among the different races and factions there. They might encounter the powerful mages or the warrior guilds.
For Chaos Space Marine crossover fanfiction, a crossover with the Mass Effect universe is possible. The Chaos Space Marines could land on a planet in the Mass Effect galaxy and start causing mayhem. They might come into conflict with the various species like the Turians or the Krogan. The Chaos Marines' brutal nature would be a shock to the more civilized races in Mass Effect. Additionally, a crossover with the God of War universe would be intense. Kratos could find himself facing these otherworldly and powerful foes, leading to epic battles.
Well, a cool space marine crossover fanfiction idea could involve crossing them with superheroes. Picture a space marine teaming up with Superman to fight an intergalactic threat. Or perhaps a crossover with the Predator universe. The space marines' combat skills and high - tech gear against the Predator's hunting skills would make for an exciting story. Also, a crossover with the Warhammer Fantasy world, bringing the space marines into a world of magic and medieval - like warfare.
One interesting concept could be the combination of different power sets. For example, a space marine's combat skills combined with the dreadnought's heavy firepower in unique battle scenarios. Another might be the exploration of the relationship between a space marine who is transferred into a dreadnought and how they adapt to their new form.
First, decide on the two universes you want to cross. For example, if it's Chaos Space Marines and the Transformers universe, research both. Know the lore, the characters, and the settings. Then, come up with a central plot idea. Maybe the Chaos Space Marines are after a powerful artifact that the Autobots are also protecting. After that, create your main characters. You can introduce a Chaos Space Marine who has different motives from his brethren. Start writing simple scenes, like the initial encounter between the two sides.
One idea could be a crossover with the Alien franchise. Picture Isaac Clarke in a derelict Alien ship, facing both Necromorphs and Xenomorphs. The different types of terrifying creatures could create a really intense and unique horror scenario.
One idea could be a crossover with 'Rick and Morty'. Gary could team up with Rick and they'd have some wild adventures across different dimensions. Maybe they'd encounter some new alien species together that are a combination of the creatures from both shows.
Maybe a chaos god gets trapped in the realm of another chaos god. This could lead to a power struggle within the foreign realm and some really cool battles and character development as the trapped god tries to escape or gain power there.
Well, 'The First Heretic' is a top pick. It tells the story of Lorgar and how his actions and beliefs led to the spread of chaos among the Space Marines. 'Prospero Burns' is also excellent as it gives a different perspective on the events related to the Thousand Sons. And don't forget 'Angel Exterminatus' which has some great chaos space marine elements and a really engaging plot.
One idea could be a crossover with Star Trek. The Yamato crew could encounter the USS Enterprise and have to work together to face a common enemy, like a powerful alien race that is threatening both their galaxies. They might have to learn from each other's technology and ways of handling situations.
One idea could be that they are forced to team up during a chaos invasion. The Battle Sister's faith and the Space Marine's combat skills complement each other as they fight hordes of daemons. Maybe they start off distrusting each other, but as the battle rages on, they learn to respect and rely on one another.
You could write a fanfiction where the setting of Chaos Walking is changed slightly. Instead of the usual post - apocalyptic world, it could be set in a parallel universe where the Noise is a positive thing that helps people communicate better rather than causing chaos. Or you could focus on a relationship in the story, like developing a romantic subplot between two characters who were just friends in the original.