Identity is a common theme in such fanfictions. Both Edward and Harry have their own identities within their respective worlds, and when they become mates, they have to re - evaluate and sometimes re - define who they are. There's also the theme of acceptance. Their relationship may not be accepted by everyone in their communities, so they have to fight for acceptance while also dealing with their new - found bond as mates. This creates a lot of drama and interesting plotlines in the fanfictions.
One common theme is the idea of overcoming differences. Since Edward is a vampire and Jacob is a werewolf, their different natures create a lot of tension which they have to overcome in most fanfictions. Another theme is the power of love and how it can bridge the gap between two very different beings. Also, the concept of loyalty often comes up as they have to be loyal to each other and their new relationship in the face of opposition from their respective groups.
Love and devotion are very common themes. Since they are mates, their deep love for each other is often explored. Another theme is the struggle between their different natures, with Edward being a vampire and Bella being human. Protection also comes up a lot, as Edward is always eager to protect Bella.
One common theme is the exploration of their eternal bond. Since they are vampire mates, their connection is supposed to last forever, and many fanfictions focus on how they maintain and strengthen this bond. Another theme is the challenges they face due to their different natures. Bella was once human, and becoming a vampire brings a whole new set of issues. Also, the theme of protecting each other and their family is quite common. They are mates, so they will do anything to keep each other safe.
One common theme is the exploration of a forbidden or unexpected love. Since they were previously seen as family within the Cullen coven, their new relationship as mates goes against the normal perception. Another theme is the discovery of self - identity. As they become mates, they might question who they are within the family and the vampire world anew. For example, Esme might wonder how her role as Carlisle's wife was different from her new role as Edward's mate.
Friendship is a very common theme. It shows how Harry's relationships with his mates are crucial for his growth and survival in the wizarding world.
Friendship is a very common theme. Harry and his mates often rely on each other and form deep emotional bonds. Another theme is adventure, as they usually embark on various quests and challenges within the wizarding world.
One common theme is redemption. Severus, who has a complex past, often finds redemption through his relationship with Harry. Another theme is the power of love. Their love as mates overcomes the barriers of age, past enmity, and social expectations in the wizarding world. Also, acceptance is a big theme. They have to accept their bond and each other's flaws, which is not easy given their different backgrounds and personalities.
Friendship is a major theme. Since they are mates, the stories often focus on how they support and understand each other. For example, in many fanfics, when Harry is in trouble, Charlie is there to help him out using his knowledge of dragons.
Forbidden love is also a big theme. Given their past enmity and the different paths they were on in the original story, their relationship as mates is often portrayed as something that is not easily accepted in the wizarding society. Writers like to play with this idea of two characters who were supposed to be enemies falling in love.
Forgiveness is also a major theme. Harry has to forgive Snape for all the times he was cruel to him, and vice versa. Also, mentorship is often explored. Snape, with his vast knowledge of magic, can become an unexpected mentor to Harry. They can learn from each other in ways that the original story didn't fully explore. And of course, friendship. The idea of two people who were enemies becoming friends is a very appealing theme in these fanfictions.