Another theme is the power of death. Death is often depicted as a powerful force, sometimes with a will of its own. It can be a character that controls the fates of others, or a concept that the protagonists must either overcome or come to terms with. For example, in some stories, characters try to cheat death, which leads to all sorts of supernatural consequences. It's also about the boundary between life and death. There are often elements that blur this line, like ghosts, undead creatures, or near - death experiences that give characters a glimpse into the other side. This creates an atmosphere of mystery and the unknown.
Some common themes include the power dynamics. The Angel of Death is extremely powerful, and fanfictions often explore how this power is perceived and dealt with by other characters. There's also the theme of redemption. Maybe the Angel of Death has made mistakes in the past and is seeking to make amends. And of course, love and friendship can be themes too. They could develop a bond with a human or another supernatural being that challenges their original purpose.
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.
A common theme is power and its consequences. Since Harry is the master of death, he has a great deal of power, and fanfics often explore how he uses or is tempted by it. Another theme is the blurring of boundaries between the known magical world in Harry Potter and the added supernatural elements.
One common theme could be the struggle against death. Since it has 'a stroke of death' in the title, stories might revolve around characters facing near - death experiences and how they cope.
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.
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.