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.
If Bilbo goes back in time to when he first met the dwarves, his relationship with them would be quite different. He would already know them well, and they might be more suspicious of his prior knowledge. But he could also use this to his advantage and form even stronger bonds with them more quickly, as he would understand their personalities better from the start.
Bilbo would likely interact with Gandalf again. Since Gandalf has a long presence in Middle - earth's history, he could be a key figure for Bilbo in the past. Also, the dwarves, especially Thorin Oakenshield. If Bilbo goes back to a time related to the Lonely Mountain, he would surely cross paths with them. And elves like Elrond. Elrond has a vast knowledge and his presence in different historical events makes him a likely character for Bilbo to meet.
One plot idea could be that Bilbo goes back in time to the founding of the Shire. He could use his knowledge from his own time to help shape the early laws and traditions in a more positive way. For example, he might introduce better farming techniques he learned from his travels, which could lead to the Shire being even more prosperous in the long run.
Well, in 'Bilbo goes back in time' fanfiction, a possible plot is that Bilbo goes back to the time before Smaug took over the Lonely Mountain. He could then try to warn the dwarves and help them better prepare for the dragon's arrival. This might involve him teaching them new battle strategies or helping them find a better hiding place for their treasures. Another interesting idea is that Bilbo travels back to the time of the great elven kingdoms' prime. He could experience the height of elven culture and maybe even learn some ancient elven magic that he could bring back to his own time.
One popular theme is changing the past. In many fanfictions, Bilbo tries to alter certain events in Middle - earth's history through time travel. Another theme is exploration. He travels to different times and discovers new places and cultures. For example, he might visit the ancient dwarven kingdoms at their peak.
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.