Well, 'The Lost Chapters of Leon and Ada' is a fanfiction that fills in the gaps of their story that the official games might have left out. It gives more backstory to their relationship and their individual struggles. Then there's 'Ada's Allure for Leon'. This fanfiction really plays up the attraction between them, showing how it affects their decisions. Also, 'Leon and Ada in a Parallel World' takes them to a different dimension where they have to face new challenges and reevaluate their relationship.
There's also 'Ada and Leon: Shadows of Raccoon City'. This fanfic takes place after the events in Raccoon City. It shows how their paths cross again and how they deal with the lingering traumas from that time while still being drawn to each other. It's a really engaging read as it adds new layers to their relationship.
One common plotline is the rescue mission. Maybe the baby is in danger, and both Leon and Ada have to put aside their differences to save it. Another could be a mystery where the baby has some special significance, like it holds a key to a secret that both Leon and Ada are trying to uncover. There's also the family - like plot where they end up taking care of the baby together and it starts to feel like a makeshift family, with all the complications and warm moments that come with it.
Well, a plot could revolve around Ada getting injured and Leon having to take care of her in a safe house. During her recovery, they have long conversations about their lives, their choices, and their feelings for each other. It could be a time when they really open up to one another and start to see a future together that they never thought possible before.
Hunnigan could be a great addition. She could provide Leon with information and support from the outside, and her presence could add some tension as she might be suspicious of Ada's motives. Another good character is Wesker. His past connection to Ada could create more drama and conflict in the story. He could be a shadowy figure trying to manipulate the situation between Leon and Ada.
Well, there are several interesting Ada and Leon fanfictions. For example, 'The Encounter in the Shadows' is a fanfic that explores their first meeting from a different perspective. It shows how their initial distrust slowly turns into a begrudging respect. 'Ada and Leon: A New Alliance' is also good. It's set in a world where they have to team up against a new, powerful enemy and in the process, their relationship evolves in unexpected ways. Then there's 'The Lost Chapters of Ada and Leon' which fills in the gaps of their story that the official games might have left out.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Ada Wong and Leon' in the search bar, and a whole list of relevant fanfictions will come up. AO3 has a great tagging system which makes it easier to find specific types of stories, like ones focused on their relationship or action - packed adventures they might have together.
One common theme is trust. Since they often find themselves in precarious situations, the question of whether they can trust each other fully is a big part. For example, in many fanfics, Leon has to decide if he can trust Ada's motives.
One common theme is the struggle between love and duty. Leon and Ada are often on different sides in the official stories, so fanfics explore how their feelings for each other play out against their respective missions. For example, in many fanfics, Ada has to make a choice between helping Leon and fulfilling her own tasks.
I think there is some hint of a potential love story. Their interactions have that sort of tension and chemistry.
Another great piece could be 'Hidden Desires'. It delves deep into the characters' psyches. The kiss in this story is a turning point, after which their relationship takes a new direction. It's full of emotional depth and makes the readers really feel the connection between Leon and Ada.