One common theme is the idea of an unbreakable bond. Since imprinting is such a strong concept in the Twilight world, fanfictions often explore how this bond between Seth and Bella is unshakable, no matter what challenges they face.
The theme of acceptance also features prominently. This includes both Seth and Bella accepting their new relationship, as well as the other characters in the Twilight world accepting their bond. The werewolf pack, for instance, has to come to terms with Seth's imprint on Bella, who was previously involved with Edward and Jacob. This can lead to a lot of drama and interesting character interactions within the fanfiction.
A major theme is growth. Both Paul and Seth grow as individuals and as a pair. They learn about themselves and each other. Also, the theme of loyalty often comes up. Their loyalty to each other and to the pack has to be re - evaluated and adjusted because of the imprint. For example, in some fanfics, they have to prove their loyalty to the pack while still maintaining their new bond.
One common theme is friendship. Since they come from different backgrounds in the 'Twilight' world, their friendship is often explored in fanfictions. For example, how they support each other through tough times.
One common theme is the exploration of an unexpected relationship. Since in the original context, Bella has other relationships, the fanfiction often focuses on how she and Seth come together in a new and unique way. Another theme is loyalty. Seth is often portrayed as extremely loyal to Bella, and this loyalty is a central part of many stories.
One common theme is the exploration of a non - traditional relationship. Since it goes against the normal pairings in the Twilight series, it often delves into how society within the story (the vampire and human world) reacts to it. Another theme is self - discovery for both Bella and Rosalie. As their relationship forms, they learn more about themselves and their place in the world around them.
One common theme is the struggle with the unexpected. Paul suddenly imprinting on Bella is a huge shock, and many fanfictions explore his internal conflict as he tries to come to terms with this new feeling.
Conflict is also common. There could be conflict between the vampire and werewolf factions due to Bella's imprinting. Or there might be internal conflict within Bella herself as she tries to come to terms with the sudden and powerful imprinting bond that has changed her life so drastically.
One great fanfiction could be 'Seth's Unwavering Bond' where it delves deep into how Seth's imprint on Bella changes his life. It shows his growth from a young werewolf to someone with a newfound purpose because of the imprint.
One common theme is the idea of forbidden love. Since Bella was initially involved with Edward in the original story, her new relationship with Seth can be seen as something that goes against the norm in that world. Another theme is self - discovery. Bella often discovers new aspects of herself through her relationship with Seth.
Love against all odds is a big theme. In many 'bella and seth imprint fanfiction' stories, they have to face various obstacles like the disapproval of the pack or Bella's own confusion. Another theme is self - discovery. Seth discovers a new side of himself through the imprint, and Bella also learns more about her feelings and what she really wants in a relationship.
Love and attraction are very common themes. Since it's about Bella and Seth, the fanfictions often focus on how they fall in love or are attracted to each other.