Often, there's the theme of mystery. The origin and nature of giant blood can be a mystery in fanfiction. It might be something that the character has to discover about themselves. Maybe they start to notice strange abilities and have to figure out if it's related to their giant blood. Also, the theme of loyalty can come into play. If there are groups that are against those with giant blood, a character might have to decide where their loyalty lies - with their own kind or with the wizarding society that may not fully accept them.
Another theme is power. Female giants are typically portrayed as very powerful physically. Some fanfictions explore how this power can be used for good or bad. In one story, a female giant is tempted by dark wizards to use her power against Hogwarts, but she resists. This shows the internal struggle of having great power.
One common theme could be power struggles. The 'blood god' concept might introduce a new source of power, leading to characters vying for control. Another theme could be the exploration of dark magic. Since it involves a 'blood god', it's likely that dark and forbidden magic plays a role. Also, there might be themes of redemption or corruption as characters interact with this new and powerful entity.
Power and its implications can be a theme too. Their 'blood brother' bond might give them access to unique powers or make them a target for those who want to use their power. This can lead to a lot of conflict and drama in the fanfiction, as they have to deal with the consequences of having this special bond.
Family heritage is another theme. Since blood is related to family, many fanfictions explore how blood magic is tied to one's family lineage and the secrets that come with it. For example, a character might discover a long - lost family magic through blood magic. It also often delves into the darker aspects of magic, as blood magic is usually considered a more dangerous and morally ambiguous form of magic in the Harry Potter universe.
In many of these fanfictions, acceptance is a big theme. The character may be feared or misunderstood because of their dragon animagus form, and they have to fight for acceptance from their friends and the wizarding community. Also, adventure is quite common. The dragon form often takes the character on exciting adventures, like exploring hidden parts of the wizarding world or fighting against ancient evils.
Another theme is the discovery of new magic. With the merging of two different magical concepts, fanfiction often features characters exploring new forms of magic that are unique to this combined universe. For example, spells that are a combination of Hogwarts magic and the powers of the demigods. This makes the stories exciting as readers get to see something new and different.
One common theme is the discovery of a hidden power within the blood. It often leads to a journey of self - discovery for the character. For example, they might find out they can do things that no one else can because of their blood - gift.
One common theme could be sacrifice. In a fanfic, a character might be 'blood stained' as a result of sacrificing themselves to save others, like in the original series where many characters put themselves in danger for the greater good. Another theme could be revenge. A wronged character seeking revenge might get 'blood stained' in the process of getting justice.
Common themes in 'Harry Potter' fanfiction also include the backstories of minor characters. Writers often create detailed backstories for characters like Neville's family or Luna's early life. There are also fanfictions that revolve around the different houses in Hogwarts and their unique cultures. Some explore how students from different houses interact more deeply or how a character might change if they were sorted into a different house. Fanfiction gives a chance to expand on the rich world that J.K. Rowling created in the 'Harry Potter' series.
One common theme is alternate universes. Writers like to imagine what would happen if Harry was in a different magical school or if the wizarding world had different rules. Another theme is relationships, like exploring a romantic relationship between Harry and a different character than in the original books.