One common theme is loyalty. Ziva's loyalty to her team and her past loyalties often play a big role. Another is survival, as the Silver War implies a difficult and dangerous situation.
Many of these fanfics explore Ziva's inner conflict. The Silver War might force her to make tough choices between different allegiances. Also, themes of redemption can be found. Maybe she's trying to atone for past actions during this chaotic time. Friendship and trust within the NCIS team are also common themes, as they have to rely on each other during the Silver War.
One great source could be fanfiction.net. There are often a variety of NCIS fanfics related to Ziva and the Silver War arc. You can search by tags and ratings to find ones that suit your taste.
One common theme is friendship. Writers often explore how an OC can become friends with Ziva, showing different aspects of Ziva's personality through her interactions. Another theme is mystery, like when the OC is somehow involved in a case that Ziva is working on and there are secrets to be uncovered.
Love and romance are very common. Fans like to explore the relationship between Tony and Ziva more deeply. Another theme is adventure. They might write about Tony and Ziva going on secret missions that weren't shown in the original show.
One common theme is the unspoken attraction between them. In many fanfictions, they have feelings for each other but are hesitant to admit it. Another theme is the partnership aspect, how they work together as a great team and that eventually leads to a deeper connection. And of course, the theme of trust, as they learn to trust each other more and more in different storylines.
One common theme is the adjustment of Ziva's life. Her pregnancy forces her to reevaluate her role in the NCIS team and her personal life. Another theme is the support she gets from her colleagues. They often become like a second family, helping her through the difficult times.
Family is also a big theme. Since they both have complex family backgrounds, fanfictions often explore how they create their own family unit. For instance, how they deal with in - laws or how they plan to raise their children.
Family is a huge theme. Since it's about their daughter, it often explores how she fits into the family unit created by Tony and Ziva. It shows how family traditions are passed down, like a love for solving mysteries.
One great NCIS Silver War fanfic could be 'The Silver Lining in the War'. It focuses on the characters' growth during the challenging times of the Silver War in the NCIS universe. Another one might be 'Silver War Echoes' which delves deep into the emotional turmoil of the characters.
One common theme could be friendship. Since they are both part of the NCIS team, writers might explore how they become friends and support each other. Another theme could be professional rivalry, as they both are intelligent agents and might compete in some aspects of their work.
I'm not sure specifically about 'lemon' fanfics as they often contain inappropriate content. But there are many great Abby and Ziva - centered fanfics that focus on their friendship and teamwork. You can try searching on popular fanfic websites like Archive of Our Own and filter for NCIS fics involving Abby and Ziva.