There are many talented authors in the fanfiction community. However, it's hard to single out the 'best' as it depends on personal taste. Some authors who are well - known for their Sanguinius fanfictions are those who have a deep understanding of the Warhammer 40k lore. They are able to weave complex stories that stay true to the character of Sanguinius.
One author that comes to mind might be [Author Name], who has written several fanfictions that really capture the essence of Sanguinius. Their stories often focus on his heroic deeds and the internal struggles he faces. Another great author could be [Another Author Name], who is known for creating unique scenarios for Sanguinius to be in, like exploring uncharted planets or dealing with ancient threats.
One interesting Sanguinius fanfiction could be about his early days as a Primarch. It might explore his relationship with the Emperor and how he was trained. Another could be a story where he faces a great enemy that challenges his ideals and strength. And there are also fanfictions that focus on his role in leading his legion and the sacrifices he made for the Imperium.
Magnus the Red is also an interesting choice. Given his connection to the warp and his fall from grace, there are many stories that can be told. Maybe a fanfiction where he tries to redeem himself in some way, or a story that delves deeper into his relationship with his father, the Emperor, before his downfall.
There's also a fanfiction called 'Emperor's Will'. In this story, it delves deep into the Emperor's thoughts and plans that were perhaps left unfulfilled during the original lore. It shows how his will could have been executed differently to change the fate of the Imperium. This fanfiction is quite detailed and really makes you think about the Emperor's capabilities and intentions.
Another good one is 'Space Marines: Redemption'. This fanfiction follows a fallen Space Marine who tries to find redemption. The story has a lot of moral dilemmas and the writer does a great job of exploring the psyche of a Space Marine who has strayed from the path of the Emperor. It's a very character - driven story that keeps you hooked from start to finish.
One great Warhammer 40k fanfiction is 'The Emperor's Gift'. It delves into the relationship between a Space Marine and a young psyker. The story is full of action and the exploration of the complex lore of the 40k universe. Another is 'The Lost Legion', which offers a unique take on a lost chapter of Space Marines and their journey to regain their honor. And 'Sister of Battle: Redemption' is also excellent, following a Sister of Battle on her path of atonement and her battles against the forces of chaos.
One great 'Warhammer 40k Imperial Guard Fanfiction' is 'The Last Stand of the 13th Platoon'. It really shows the tenacity and sacrifice of the Imperial Guard. The way the characters are developed makes you feel like you're right there in the thick of the battle with them.
One great 'Warhammer 40k Emperor Crossover Fanfiction' is the one where the Emperor crosses over into a modern Earth setting. It shows how his powerful psychic abilities and leadership skills shock the modern world.
In Warhammer 50k fanfiction, characters like the Sisters of Battle are quite popular. They are strong, devout warriors, and their stories of faith and combat can be really inspiring. There are also Inquisitors who are often central characters. They have the power to investigate and root out heresy, and their complex personalities, some being more noble and some being more morally ambiguous, make for great storytelling. Additionally, the Ork warbosses can be popular as they bring a lot of chaotic and violent energy to the stories.
Horus Lupercal is a very popular character. His fall from grace and the events leading up to it are often the focus of fanfictions. Another popular one is Magnus the Red. His connection to the warp and his attempts to warn the Emperor make for great story material. Also, Leman Russ is popular. His no - nonsense attitude and his relationship with his legion are often explored in fanfic.
Some of the best Warhammer 40k novels include 'Horus Rising' by Dan Abnett. It gives great insights into the early days of the Horus Heresy. Another good one is 'Gaunt's Ghosts' series which follows the Tanith First and Only regiment and their many battles.