One common theme is the struggle between his human side and his vampire instincts. Finnick often has to fight against his newfound bloodlust while still holding onto his humanity.
There's also 'Finnick, the Vampire Hunter'. It's a unique take as it has Finnick in a dual role - part vampire and part vampire hunter. It's full of action scenes and has a lot of complex relationships between the characters that make it a great read.
A great Finnick Odair fanfiction often has a deep understanding of his character. It should capture his charm, his pain, and his complexity. For example, if it delves into his experiences in the Hunger Games and how it affected him, that can make it really good.
Finnick Odair's love story could begin in the Capitol. At a grand party, he spots a mysterious woman. Her beauty and grace catch his eye. As they start to talk, he discovers she's not like the Capitol people he usually has to deal with. She has a deep understanding of the pain he's been through. Their relationship develops as they secretly meet in the Capitol's hidden corners, sharing kisses and whispered promises of a future away from the Capitol's cruelty.
You can find Finnick Odair fanfiction on websites like Archive of Our Own (AO3). It has a large collection of fanfictions about various characters including Finnick. Fanfiction.net is also a good place. There are many authors who post their Finnick - related stories there.
Annie Cresta would be an obvious choice. Their relationship in the original story was deep and complex, so exploring it more in fanfiction could be great. Another good character to pair him with could be Katniss Everdeen. They both had strong personalities and were part of the rebellion. Their interactions could lead to some interesting storylines. Peeta Mellark could also be a good pairing. Finnick could help Peeta during the Games or in the post - Games situation, and their different skills and personalities could create some engaging scenes.
One common theme is his trauma. Given his experiences in the Hunger Games and his exploitation, many fanfics explore how he copes with that. Another theme is love. Finnick's relationships, whether it's his love for Annie or his friendships, are often central in fanfics. And there's also the theme of resistance. As a strong character, he is often depicted as part of the resistance against the Capitol in fanfics.
One common theme is protection. Finnick is often depicted as very protective of his sister, given the dangerous world they live in. For example, in many stories, he shields her from the Capitol's cruel games and demands.
One common theme is trust. Given Finnick's past and the dangerous world they live in, building trust between Finnick and the reader is often a central part of the stories. Also, sacrifice is a theme. Finnick might be willing to sacrifice himself for the reader, or vice versa. And of course, the theme of hope, that their relationship can bring hope in a dark world like Panem.
There are many great authors. One is 'MockingjayLover' who writes some really in - depth stories about Finnick. Another is 'PanemWriter' who often focuses on Finnick's relationships in their fanfics. And 'HungerGamesFan22' also has some good works.