One interesting storyline could be Tony Dinozzo using his detective skills learned from the military in a civilian crime - solving situation. Maybe he has to use his military training to track down a dangerous criminal who has military - like tactics.
Another storyline could be about his time in the military itself. For example, his relationships with his comrades. He might have a best friend in the military who he later reconnects with in civilian life and they solve a mystery together. There could also be a love interest he meets during his military service.
One interesting storyline could be them teaming up on a top - secret mission. They have different skillsets, Natasha with her combat and espionage skills, and Tony Dinozzo with his investigative and street - smart abilities. Their interactions during the mission, like initial clashes due to different working styles and then gradually growing to respect each other, can make for a great plot. Maybe they discover a conspiracy that reaches far beyond what they initially thought, and they have to rely on each other to expose it.
One possible storyline could be that Tony Dinozzo is facing extreme pressure at work, like constantly being in dangerous situations and feeling responsible for the safety of his team. This stress builds up over time and he starts to think that his death would relieve everyone of the burden he believes he is. Another could be related to personal loss, such as the death of a close friend or family member, which makes him fall into a deep depression and consider suicide.
In some fanfictions, he could die as a result of a long - term undercover mission gone wrong. He gets too deep into the criminal underworld and is ultimately betrayed by someone he thought he could trust. His death shocks everyone, and the team has to deal with the guilt of not being able to protect him while also trying to take down the people responsible.
Some fanfictions explore the idea of Ziva and Tony starting a family. It shows how they would handle the challenges of parenting while still being involved in their dangerous line of work. There are also stories that revolve around them solving a particularly difficult case that hits close to home for one of them, which brings out new aspects of their relationship.
A fanfiction could center around Tony Dinozzo's relationships in the context of having ADHD. He might have to explain his condition to his colleagues, like Gibbs and Ziva. It could show how they support him or misunderstand him at times, adding depth to their interactions.
One interesting plot idea could be that Tony and Spencer are assigned a particularly difficult case. They have different approaches at first, with Tony relying on his street smarts and Spencer on his vast knowledge. As they work together, they start to understand and respect each other's methods more, and in the end, they solve the case in a way that combines both of their strengths.
A third plot idea might be that Tony and Jeanne meet again in a different country while they are both on vacation. They start to explore the local area together and slowly realize that they still have a connection. However, they both have different lives now, and they have to decide if they want to start over or just leave the past in the past.
One interesting story could be where Tony Dinozzo somehow gets transported into the Harry Potter world. He might use his detective skills to solve some mysteries within Hogwarts. For example, he could help figure out who's been stealing potions ingredients from Snape's storeroom. His modern - world knowledge and sharp mind would make for an exciting addition to the magical world.
There are several interesting aspects to Tony Dinozzo in the context of a Sentinel - Guide fanfiction. First of all, his character's natural observational skills from the original show could be enhanced in the Sentinel - Guide universe. He might be a Sentinel with his sharp eyes and ears always on the lookout for details. His Guide could potentially be someone who helps him manage the overload of sensory input. For example, in a fic, they could work together to solve crimes in a more supernatural - tinged world, where Tony's Sentinel abilities give him an edge in detecting things that normal investigators would miss.
The mystery of his early life. We know Tony Dinozzo as an adult in the main series, but fanfiction about his baby or young days allows us to peek into what might have made him who he is. It's like filling in the blanks of his character development.