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.
There are often fanfiction pieces that explore the relationship between Bilbo and the reader in a romantic way. For example, a story could start with the reader being a new arrival in the Shire and gradually falling in love with Bilbo as they get to know his kind and curious nature. You can search for these by using specific tags like 'Bilbo Baggins x Reader' and 'Romance' on fanfiction websites.
Well, 'Under the Stars with Bilbo' is a must - read. It has a very calm and peaceful atmosphere where Bilbo and the reader share some really intimate moments. The author's writing style makes you feel like you are right there in Middle - earth with them. And then there's 'Bilbo and the Reader's Quest'. This one has an interesting plot where they go on a quest together and their relationship blossoms along the way.
One idea could be that Female Bilbo Baggins joins a traveling caravan by accident. Maybe she was exploring the Shire and got separated from her group, and the caravan took her in. She could then use her wits and hobbit charm to make friends within the caravan, and they could have all sorts of adventures together, like facing off against bandits or discovering a hidden magical place.
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.
Self - discovery is also a theme. Just as Bilbo discovers his own courage and capabilities during his adventures, the OC may also be on a journey of self - discovery. They could be learning about their own powers, their place in the world, or their true identities, all while being influenced by their interactions with Bilbo.
The theme of discovery is also prevalent. Many young Bilbo Baggins fanfictions depict his discovery of new places, cultures, and ideas. This could be his first encounters with elves or dwarves, and how these meetings broadened his horizons and made him question the small - mindedness of some in the Shire.
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.
One great Bilbo Baggins time travel fanfiction is 'Bilbo's Unexpected Journeys Through Time'. It has Bilbo traveling to different eras in Middle - earth's history. He meets his ancestors and gets involved in events that shape the future of the Shire. The author does a wonderful job of keeping Bilbo's character true to the original while adding the exciting element of time travel.