Love can be a theme as well, although not always in a romantic sense. It could be the love for the land of Middle - earth, the love for the fellowship, or in some cases, a romantic love between the reader and Bilbo. This adds an extra layer of depth to the story and the relationship between the characters. Fanfictions explore how love can grow and change in the midst of adventure and danger.
Adventure is a very common theme. Since Bilbo is known for his adventures in Middle - earth, fanfictions often involve the reader joining him on these exciting quests. Another common theme is friendship. The relationship between the reader and Bilbo grows as they face challenges together.
One common theme is empowerment. Female Bilbo is often shown as a strong, independent character who can hold her own in a male - dominated world like Middle - earth. For example, she might be the one to come up with clever solutions to problems that the dwarves can't figure out.
One common theme is self - discovery. Young Bilbo is often portrayed as trying to figure out who he is and what he wants in life. For example, in many fanfictions, he starts to question the simple, comfortable life in the Shire and yearns for something more adventurous.
Redemption can also be a theme. Thorin's pride and how he might overcome it with Bilbo's help is something seen in some fanfictions. And loyalty, both to each other and to the company they are part of, is frequently a central theme as well. For example, in some stories, they are tested in terms of their loyalty to one another during difficult situations.
Love is also a prevalent theme. Whether it's a platonic love or a romantic one, many fanfictions play with the idea of their feelings for each other. Some explore how their different backgrounds, Thorin as a dwarf king and Bilbo as a hobbit, influence the way they express their love and care for one another. It can be a very interesting exploration of their characters' emotions.
One common theme is the struggle with identity. Bilbo as a vampire has to come to terms with his new self. Another is the isolation that often comes with being a vampire in a world that doesn't understand them. And of course, there's the theme of forbidden love, as his vampiric nature might put barriers in his relationships.
The theme of redemption can also be found in some 'dragon bilbo fanfiction'. Maybe the dragon has done bad things in the past and through its relationship with Bilbo, it tries to redeem itself. And of course, the theme of magic is prevalent. Dragons are magical creatures, and when combined with Bilbo's world, it creates a lot of magical elements in the stories.
One common trope is the 'fish out of water' scenario. The reader, coming from a different world or background, has to adjust to the Shire's ways. For example, they might be confused by the hobbit's love for simple pleasures like gardening and smoking pipe - weed. Another trope is the 'damsel/gentleman in distress' where either Bilbo or the reader gets into trouble and the other has to save them during an adventure.
A major theme in these fanfictions is the relationship changes. His friends, like the dwarves or Gandalf, might react differently to him as a vampire. Also, the theme of temptation is present. The urge to drink blood and how Bilbo resists or succumbs to it is often explored in detail. For example, in some stories, he has to find alternative ways to satisfy his vampiric thirst without harming the innocent. This adds a layer of complexity to his character and the story as a whole.
One common theme is the exploration of their relationship under this new and unexpected circumstance. Another could be how the characters from Middle - earth react to this rather unorthodox situation. Also, there might be themes related to the challenges of pregnancy in a fantasy setting.
One common theme is the exploration of gender roles. Since Bilbo is male in the original, making her female in fanfiction allows for a new look at how she would handle situations in a world with traditional gender expectations. For example, how a female Bilbo would be treated by male dwarves during their journey.