Another option is to check out Tumblr. There are often fanfiction writers who post snippets or links to their full Bilbo Baggins female fanfiction on their blogs. You can search for relevant tags such as #BilboBaggins #femalefanfiction. But be aware that Tumblr's format can be a bit more scattered compared to dedicated fanfiction websites, so it might take some more time to find exactly what you want.
You can start by looking on major fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including ones related to The Hobbit and Bilbo Baggins. Just use the search function and type in relevant keywords like 'Bilbo Baggins female' to find the stories you're interested in.
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 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.
There are fanfictions where a female Bilbo is depicted as a more diplomatic figure. In these stories, her femininity is used to her advantage in the world of Middle - earth. For instance, she could use her charm and intuition to smooth over difficult situations with the dwarves or other creatures. Some fanfictions also explore how a female Bilbo would be received in the male - dominated society of Middle - earth and how she would break gender norms.
One idea could be that Female Bilbo Baggins uses her adventures in the Shire as teaching lessons in Ered Luin. For example, she could teach about courage by sharing how she faced the spiders in Mirkwood. Maybe she also imparts knowledge about different cultures she encountered on her journey.
I've also heard of 'Bilboa: The Female Hobbit'. This fanfiction not only changes Bilbo's gender but also delves deeper into the hobbit culture from a female perspective. It explores how a female Bilbo might interact with the male - dominated hobbit society, all while going through the main events of the original story with a fresh take.
In the fanfiction, Female Bilbo Baggins could fall in love with someone in the traveling caravan. It could be a human or a dwarf. This would create a whole new set of challenges and adventures. For instance, if it was a dwarf, they would have to deal with the cultural differences between hobbits and dwarves. Their relationship would also change the dynamics within the caravan as the other members would react in different ways.
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.
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 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.
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.