One common theme is redemption. Since Balthazar has a rather checkered past in the Supernatural universe, many fanfictions explore his journey towards making amends for his actions. For example, he might help the Winchesters in a big way to earn his place in heaven again.
Another theme is power and its consequences. Balthazar is a powerful angel, and fanfictions often deal with how he uses or misuses his power. Sometimes he has to face the fallout of using his powers recklessly, like accidentally causing harm to humans or getting on the wrong side of other angels.
One common theme is the struggle against fate. Since in the Supernatural world, things are often chaotic and dangerous, the idea of having a soulmate can seem both a blessing and a curse. So, characters often struggle with whether to embrace the connection or fight it.
There could be a fanfiction where Balthazar teams up with the Winchester brothers in a different way than in the show. For example, they go on a mission to an alternate dimension to stop a powerful demon that is threatening all of existence. This would give a whole new perspective on his character and how he interacts with Sam and Dean.
One great 'Supernatural Balthazar Soulmate' fanfiction is 'Soulbound with Balthazar' on FanFiction.net. It has a really interesting take on the soulmate concept in the Supernatural universe, with well - written characters.
One great Supernatural Balthazar fanfiction is 'The Adventures of Balthazar'. It has an interesting plot where Balthazar gets involved in a time - traveling adventure to save a small town from a powerful demon. The author does a great job of portraying Balthazar's character, his charm and his wits.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of 'Supernatural' fanfictions, and you can specifically search for those related to Balthazar. Just use the search bar and type in 'Balthazar Supernatural' and you'll get a bunch of results.
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 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.