Yes, there are quite a few. You can start by looking on popular fanfiction websites like Archive of Our Own. There, you might find stories that explore unique relationships between Fornell and original characters. Some might focus on their teamwork in solving cases, while others could be more about their personal interactions outside of work.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions from various fandoms, including NCIS. You can simply search for 'NCIS Fornell OC' and it'll show you relevant stories.
One idea could be that there's a new dark force emerging that is using both magic and Muggle technology in a devious way. Harry, with his magical abilities, and Fornell, with his understanding of Muggle law enforcement, team up. They might start off not trusting each other fully, but as they face various challenges together, they learn to rely on one another's strengths. Fornell could be introduced to the magical world's rules and Harry could learn about Muggle detective methods. They could then use this combined knowledge to track down the source of the new threat.
It could be a dark wizard who has found a way to manipulate Muggle technology for his evil purposes. He could be using it to create chaos in both worlds, which would draw Harry and Fornell together to stop him.
I would also mention 'All Souls'. This novel gives a vivid picture of Oxford life. Marias has a unique way of portraying the academic environment, the people in it, and the underlying tensions and emotions that exist within the community.
Javier Gonzalez might be an expert in a particular field related to the story. For example, if the story is about a historical event in a certain region and he is a local historian, then he would be in a good position to tell it. Or he could be a family member who has been passed down the story through generations and is now the keeper of that narrative.
Well, it depends on various factors. Maybe some parts are true, while others could be exaggerated or fabricated. Without further investigation, it's tough to give a definite answer.
A good Javier Pena fanfic often has a strong understanding of his character. It should capture his essence, like his determination and his no - nonsense attitude. For example, if it's set in the world of his work, it should show his skills and how he approaches different situations realistically.