Without more context, it's difficult to provide the full story of Kay Estella Zeehandelaar. If she is a local figure in a particular community or part of a specific industry, more details about that area would be needed to tell her story.
Some of the best fanfics often have detailed character development and an engaging plot. Look for ones that really dig into the personalities of Count D Leon and Uke Leon. For example, a fanfic that shows how their relationship evolves over time, through different challenges and events. Maybe there's a fanfic where they have to team up against a common enemy and in the process, their bond deepens.
Sadly, I can't tell the full story of Kay Estella Zeehandelaar. There are no public records or common knowledge about her that I can access. If there were some more details like her profession, location, or the area she is associated with, it would be easier to start building her story.
The Resident Evil novel with Leon as the main character was Resident Evil: East of Eden. The other search results did not mention any novels with Leon as the main character. Therefore, I don't know of any other novels that have Leon as the main character.
Well, it's highly likely that such a fanfiction exists. Fanfiction authors are known for their creativity in combining different universes and characters. Since Naruto is a popular anime character and Leon could be from various other works, it's not far - fetched to think that a fan has written a story where Naruto has an admiration for Leon. You can try using search engines specific to fanfiction, like Wattpad as well, to look for it.
Well, it's not a straightforward traditional love story. It has undertones of love and affection, but it's more about the bond and loyalty between the characters rather than a typical romantic love.
You can try looking on popular fanfic platforms like Archive of Our Own (AO3). There are often various fanfics related to different characters and pairings. Just search for 'Count D Leon' and 'Uke Leon' in the search bar, and it should show you relevant stories if any are available.
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.