Well, in Naruto Warhammer 40k fanfiction, a cool concept could be how Naruto characters adapt to the different factions in 40k. Like if a Naruto character joined the Space Marines, they'd have to deal with the strict code and intense training. They might bring in their own chakra - based powers to enhance the Marines' combat capabilities. Also, the idea of jutsus being used against the chaos daemons would be really exciting.
One interesting idea could be the combination of Naruto's ninja abilities with the high - tech and grimdark elements of Warhammer 40k. For example, Naruto's shadow clone jutsu might be used in a unique way on the battlefields of the 41st millennium. Maybe the clones could be used to infiltrate enemy lines or to overwhelm ork mobs.
Some fanfictions might explore the idea of Naruto's world being invaded by Warhammer 40k forces. How would the Hidden Villages respond? The shinobi would have to face off against the advanced weaponry and super - soldiers of 40k. It could also be interesting to see how the Warhammer 40k races view the concept of chakra. Maybe the Eldar would see it as a new form of psychic energy to study or manipulate.
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.
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.
A possible fanfiction idea could be her journey through the warp. The warp is a dangerous and unpredictable place in Warhammer 40k. What if she ventures into it to gain some kind of knowledge or power? How would she survive the daemons and the other horrors there? Another idea is a time - travel fanfiction. What if she is sent back in time to the early days of the Imperium? How would she change things? And finally, a fanfiction about her facing a new and unknown enemy that challenges her in ways she's never been challenged before.
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.
Perhaps a Dark Eldar wych could form an unlikely alliance with a Space Marine. Maybe the wych has a personal vendetta against a chaos warband that is also targeting the Space Marine's chapter, and they decide to work together to take down the common enemy. This would involve a lot of tense moments as they try to trust each other despite their very different cultures and motives.
Perhaps an Imperial Inquisitor ends up in the Star Wars galaxy and tries to manipulate the Sith and Jedi for his own ends. He could see the Sith as a useful tool, not realizing how dangerous they truly are until it's almost too late. This could lead to a three - way battle between the Inquisitor, the Sith, and the Jedi.
One idea could be a story about a Dark Eldar wych who is trying to rise in the ranks within her cult. She could face challenges from rival wychs and have to prove her worth in the gladiatorial arenas of Commorragh.
One interesting idea could be a story where the Space Marines from Warhammer 40k team up with the Avengers. Picture the Ultramarines and Captain America leading a combined force against a chaos incursion in New York. The Ultramarines' discipline and advanced weaponry combined with the Avengers' superpowers would make for an epic battle.
One idea could be that K has some unique jutsu that Naruto wants to learn. So he teams up with K to go on a journey to master this new type of jutsu. This could lead to a lot of fun interactions as Naruto's energetic and determined personality clashes and also meshes with K's own characteristics.
One idea could be that Naruto characters are transported to the Warhammer universe. For example, Naruto himself could be mistaken for a powerful chaos warrior due to his chakra. He might then have to prove that he's not a threat while also trying to find a way back home. Another plot could involve the shinobi clans of Naruto being compared to the different factions in Warhammer. The Uchiha with their Sharingan could be seen as having a similar level of mystery and power as some of the Warhammer sorcerers.