Family is also a big theme. Since it's about bloodlines, family relations, loyalty within the family, and sometimes family feuds are explored. For example, some fanfictions show how a character has to choose between their family's bloodline legacy and their own beliefs. It can get really complex and interesting.
The theme of secrecy is also prevalent. Many bloodlines have secrets that they need to keep hidden from the normal world or even from other supernatural beings. This creates a lot of mystery and suspense in the fanfiction, as characters are constantly trying to uncover these secrets or keep them safe.
One common theme is power. Different bloodlines have different powers, and often there are power struggles or characters trying to control or harness their own powers. Another theme is identity. Characters are often trying to figure out who they are based on their bloodline heritage.
In 'supernatural fanfiction', a frequent theme is the alternate universes. Writers like to imagine different versions of the 'Supernatural' world, where things happened differently. Romance is also a big theme, whether it's between the main characters or new characters introduced in the fanfic. Also, the origin stories of the supernatural beings are often explored, giving more background and depth to the existing lore.
One idea could be exploring the backstories of the different bloodlines in more detail. For example, you could focus on a particular family within a bloodline and how they've been affected by the supernatural elements over generations. Another idea is to create a new character who is a hybrid of two different bloodlines and show their struggle to fit in or their unique powers.
In 'grand ancestral bloodlines novel', a frequent theme is identity. Characters are usually in a journey to discover who they are in relation to their grand ancestral bloodlines. It could also involve themes of loyalty and betrayal. Some family members might stay true to the values of the bloodline while others might betray it for personal gain.
One common theme is the exploration of unknown powers. Sasuke and Naruto often find themselves with new, supernatural abilities that they need to figure out. Another theme is friendship in the face of danger. They have to rely on each other in the dangerous supernatural situations.
A common theme is the insignificance of humanity. In Cthulhu stories, humans are often just tiny specks in the face of the vast and powerful cosmic entities. Another theme is the corruption of the mind. Characters are often driven mad by the mere knowledge or proximity of Cthulhu and his ilk.
One common theme is the clash between military order and supernatural chaos. The soldier has to use his military training to deal with unpredictable supernatural situations.
One common theme could be the vulnerability of the characters. Diapers can symbolize a state of helplessness or a new level of caretaking. For example, if a character is injured or cursed, it might lead to a situation where they need diaper - like care, which adds an interesting dynamic to the relationships between characters in the Supernatural universe.
One common theme is redemption. Since Adam was sort of left behind in the show, many fanfictions focus on him redeeming himself or finding his purpose. Another theme is family. Adam trying to fit into the Winchester family dynamic is often explored.
Identity is another big theme. Nephilim are a unique blend of human and angel. Fanfictions often show them trying to figure out where they belong. Are they more human or more angel? And how do they fit into the world of the supernatural which has its own rules and hierarchies? This exploration of identity can be really interesting and complex.
One common theme is redemption. Many fanfictions explore Henriksen getting a second chance to make things right, especially after his often - antagonistic role in the show. For example, he might have a chance to atone for past mistakes.