The theme of redemption also appears in some fanfictions. Given his long absence and the state the Imperium is in when he returns, some stories portray him as a figure seeking to redeem the Imperium from its various ills, whether it be heresy, corruption, or inefficiency. This often involves him making difficult decisions and sacrifices for the greater good.
A common theme is leadership. Guilliman is a great leader, so many fanfics explore how he leads in different situations, like during battles or when dealing with political unrest in the Imperium.
Another theme is his relationship with other factions. For example, some fanfictions focus on his interactions with the Adeptus Mechanicus or the various Space Marine chapters. It shows how he tries to build alliances or resolve conflicts. In addition, his struggle to uphold the values of the Imperium while also adapting to new challenges is also a prevalent theme. He has to balance the old ways with the need for change in a very complex and often hostile universe.
One great piece of Roboute Guilliman fanfiction is 'The Primarch's Return' which delves into his post-resurrection experiences and how he readapts to the Imperium. It really captures his essence as a leader and strategist.
Well, 'Guilliman: Lord of Ultramar' is also a very good one. It gives a deep look into his character, his upbringing in Ultramar, his values that were instilled in him from a young age, and how those shape his actions and decisions throughout his life.
Definitely 'Know No Fear'. It's a classic that showcases Guilliman's military might and his role in the crucial events of the Horus Heresy.
I don't have the exact answer off the top of my head. It could potentially be in one of the more recent series or standalone novels, but you'd have to check the detailed plot summaries or consult with other avid fans of the Black Library.
Another theme is the power of friendship. Their initial friendship is a strong foundation, and many fanfictions build on this, showing how their friendship evolves into a deeper, more passionate love, and how that friendship helps them face the challenges that come their way.
One common theme is the struggle between heroism and normal life. Spider - Son often has to balance being a hero and dealing with school, family, etc. For example, in many fanfictions, he misses important family events because he's out fighting crime.
Another theme is redemption. Edgeworth has a past that he sometimes feels he needs to atone for, and in fanfiction, Wright is often there to help him through that. It's like in 'The Path to Forgiveness' where Wright helps Edgeworth come to terms with his past mistakes.
Transformation is a big theme. How the character changes physically and emotionally when they turn into a werewolf is often explored. Also, the concept of the moon is very common. Since werewolves are often associated with the moon, many fanfictions use the moon as a symbol for power, change, or even as a trigger for the werewolf's transformation. There's also the theme of the werewolf's inner struggle, like trying to control their animal instincts in a human world.
One common theme is love against all odds. Often, the two characters face many obstacles in their relationship, but their love prevails.
Love is a very common theme. Most fanfictions focus on the romantic relationship between Bright and Win, showing their love in different ways.