Well, a major theme is the power dynamics. Werewolves usually have a hierarchical structure in these fanfics, and when combined with a romantic relationship (and the lemon elements), it creates an interesting dynamic. For example, an alpha werewolf might have a more dominant role in the relationship. Also, the theme of transformation is quite common. The process of changing from human to werewolf or vice versa can add an extra layer of complexity and sensuality to the story. Additionally, themes of protection and possessiveness are often present, as werewolves are territorial and protective of their mates.
Often, in these types of fanfics, the theme of loyalty might be prominent. Natsu, as a werewolf, might have to deal with issues of loyalty to his friends or his werewolf pack (if there is one in the fanfic). Also, the struggle between his human and werewolf sides could be a major theme. For instance, his human side might have certain values, while his werewolf side has different instincts, and the fanfic could explore how he balances these two aspects. This can make for a very interesting character - study - like story.
One common theme is the forbidden love. Since werewolves are often seen as different or dangerous, the relationship between a werewolf and a human or another non - werewolf character is considered taboo in the story's context.
One common theme could be the struggle between the werewolf nature and human emotions. In these fanfictions, female werewolves might face challenges in relationships due to their dual nature. Another theme could be the allure of the werewolf form, which might be explored in a romantic or sensual context.
One common theme is the struggle with identity. Harry, as a werewolf, has to come to terms with this new part of himself that is different from what he thought he was. For example, in many stories, he has to hide it at first for fear of being ostracized.
One common theme is the intense bond between the werewolf mates. It's often portrayed as a very deep, almost spiritual connection that goes beyond the physical. Another theme could be the challenges they face together, like dealing with the werewolf pack politics or threats from other supernatural beings.
One common theme is leadership. The alpha werewolf often has to lead his pack through various difficulties like battles or dealing with other supernatural beings. Another theme is loyalty, both within the pack and towards the alpha's mate. For example, in many fanfics, pack members will risk their lives for the alpha.
Common themes in werewolf girl fanfic include power. The werewolf girl might be discovering her own powers, learning to control them, or dealing with the power dynamics within the pack. Another theme is the sense of belonging. She is constantly searching for a place where she truly belongs, whether it's a physical place or a community. And there is often the theme of secrecy, as werewolves are often a hidden part of society in these stories, and the werewolf girl has to keep her true nature a secret.
One common theme is self - discovery. Female werewolves often have to figure out their place in the werewolf world and come to terms with their powers. Another theme is love and relationships. They might fall in love with a human or another werewolf. For example, in many fanfics, the female werewolf struggles to balance her love life with her werewolf identity. Also, pack loyalty is a big theme. Female werewolves have to decide whether to follow the pack's rules or break them for what they believe is right.
One common theme is the struggle between human and werewolf nature. Hermione often has to deal with the duality of the werewolf characters she interacts with. For example, in many fanfics, the werewolf may be kind-hearted but still has the wild instincts during the full moon.
The theme of secrecy is quite prevalent. Just like in the original Harry Potter series where he had to keep his wizarding world a secret from muggles, in werewolf Harry fanfic, he often has to hide his werewolf nature. Also, the theme of power and control is common. Harry has to learn to control his werewolf powers which can be both a strength and a danger.