First, do a lot of research on the existing lore of the primarchs. Know their personalities, their backstories, and their relationships. For example, if you want to write about Vulkan, understand his connection to Nocturne and his forgiving nature.
Well, 'Leman Russ: The Great Wolf' is also among the best. It tells the story of Leman Russ, his leadership of the Space Wolves, and their unique place in the Imperium. 'Angron: Slave of Nuceria' is really good too. It shows Angron's tragic past on Nuceria and how it shaped him into the violent Primarch he became.
First, you need to research the Primarchs thoroughly. Know their personalities, abilities, and backstories. Then, decide on the crossover concept. Are you bringing in Primarchs from different time periods? Different universes? Once you have that, create an interesting starting point. Maybe it's a distress signal that draws them together or a mysterious portal. Outline your main plot points, like the conflicts they'll face and how they'll interact with each other.
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.
Finally, focus on the story. Create a plot that showcases your primarch's unique qualities. It could be a journey of self - discovery, a battle against a great enemy, or a struggle for power within the Imperium. Write in a way that draws the reader in and makes them care about your original creation.
First, you need to create your oc primarch. Decide on their appearance, like their hair color, eye color, and any unique physical features. Then, think about their personality. Are they brave, cunning, or more of a diplomat? Next, develop their backstory. Where did they come from? What events shaped them? After that, plan the plot. It could involve their rise to power, a conflict with other factions, or a personal quest. And don't forget to use the existing Warhammer 40k lore as a base, but add your own unique twists.
In Naruto Primarch fanfiction, the interactions can be complex. The Naruto characters, who are used to their own hierarchical clan systems, might initially be at odds with the more rigid and often more militaristic hierarchies associated with the Primarchs. However, over time, they could find common ground. For instance, they might bond over their shared goal of protecting their respective worlds or people. They could also exchange cultural elements, like Naruto sharing his love for ramen with a Primarch - inspired character, which could lead to some really fun and light - hearted moments in the story.
First, you need to have a solid understanding of the Warhammer lore. Know the Primarchs, their personalities, their strengths and weaknesses. For example, if you're writing about Magnus the Red, you should know about his psychic powers and his relationship with the Emperor. Then, create an interesting self - inserted character with clear motives and goals. Maybe they want to save the Imperium from destruction or just survive in this brutal universe.
One of the great primarch novels is 'Magnus the Red: Master of Prospero'. It tells the story of Magnus and his relationship with his legion and the events that led to his actions during the Horus Heresy. Also, 'Angron: Slave of Nuceria' is popular as it shows the tragic past of Angron and how it shaped him into the primarch he became.
I'm not entirely sure as I haven't read it in detail. But generally, it might be about the journey, battles, and character development of Alpharius as a primarch.