Another interesting concept is to have a Primarch face a completely new enemy. Not the usual chaos forces or xenos, but something from within the Imperium itself that has turned against it. This would create a lot of internal conflict and moral dilemmas for the Primarch to deal with.
There might be a fanfiction where a Primarch is reborn in a different era of the Warhammer 40k universe. In this story, they have to adapt to the new circumstances, which are very different from what they knew. They might find that the Imperium has changed in ways they can't fathom, and they have to fight new enemies and face new politics within the Imperium.
One idea could be an Necron Overlord who rebels against the Silent King's plan. He might start to form alliances with other races in secret to gain power and knowledge. This could lead to a whole new set of power dynamics in the Warhammer universe.
Well, in the fanfiction, perhaps the 11th Primarch has a distinct relationship with the Chaos forces. Unlike other Primarchs, they might have a more nuanced view towards Chaos, not entirely good or bad. This could lead to some really complex and engaging storylines. Another aspect could be their influence on the different factions in the Warhammer 40k world. For example, how they affect the Imperium or the xenos races.
Well, in Warhammer 40k 2nd primarch fanfiction, a cool concept is the power dynamics. The primarchs are incredibly powerful beings, and seeing how they interact with other powerful entities in the universe, like the Chaos Gods or the Emperor in different scenarios, can be really engaging. It can also show how their individual personalities shape their actions and decisions.
Character development is key. Show the growth and change of the OC Primarch over the course of the story. Maybe they start out as a naive and idealistic being, but through the trials and tribulations they face, they become a more cynical and battle - hardened leader. Use their relationships with other characters, both allies and enemies, to drive this development. Additionally, use vivid descriptions of battles, settings, and emotions to really draw the reader in and make your fanfiction memorable.
There are fanfictions where the SI becomes a Primarch's mentor or advisor. They bring in modern - day knowledge and concepts to the Warhammer universe. This can lead to really cool interactions with other characters, like the Emperor or the Space Marines. It's fascinating to see how the SI's presence can influence the politics and military strategies within the story.
One idea could be a crossover where the Primarchs from different legions have to team up against a new, unexpected threat that neither could handle alone. For example, a chaos - influenced xenos race. Another could be a scenario where they are transported to an alternate universe and have to adapt to new rules and cultures while still maintaining their primarch - like qualities. Maybe a story where they swap their legions for a time, leading to chaos and new strategies within the legions.
In this type of fanfiction, the main characters associated with the 11th Primarch can vary widely. There could be Inquisitors who are either investigating the 11th Primarch or working with him. These Inquisitors could bring their own motives and agendas. Tech - Priests might also be important characters as they could be interested in any new technology or knowledge that the 11th Primarch might possess. And of course, there could be Chaos Lords who see the 11th Primarch as a threat or an opportunity for their own dark purposes.
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.
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.