A frequent theme in these fanfictions is the OC's hidden talents or abilities. For instance, she might have a special skill in profiling that she's been developing on her own. This theme of self - discovery within the context of the 'Criminal Minds' universe is really engaging. Also, the theme of friendship within the BAU is often explored as the OC sister forms relationships with the other members of the team like Reid or Morgan.
The theme of redemption can also be found in some 'Criminal Minds JJ sister OC fanfiction'. Maybe the OC has a past mistake or something she's ashamed of, and through her work with the BAU, she gets a chance to make up for it. It adds an extra layer of depth to her character and the overall story. And of course, the overarching theme of solving crimes and bringing justice to the victims is always there as it is in the original 'Criminal Minds' show.
One common theme is family. Since the OC is a sister, there's often exploration of family dynamics within the context of the BAU. Another theme is acceptance. The OC sister usually has to prove herself to the team and gain their acceptance. For example, in many stories, she might have an unorthodox method of profiling that the team is initially skeptical about.
The theme of mystery and danger also runs through many of these fanfictions. The sister might get involved in the cases either by accident or because she has some special knowledge. This leads to her being in dangerous situations, much like the BAU team, and having to use her wits to get out of them.
Family relationships are a very common theme. Since it's about Rossi's sister, exploring how they interact as family members, with all the love, conflicts, and support that comes with it. Another common theme is mystery. Given the Criminal Minds setting, the sister might be involved in some sort of mystery related to the BAU's cases.
A common theme is family dynamics. Since it's about Tara and her OC sister, exploring their relationship, whether it's a loving bond or a more complex, strained one, is often seen.
One popular 'Criminal Minds JJ sister OC fanfiction' is 'The Unseen Sister'. It explores the relationship between JJ's sister and the BAU team in a really interesting way. The OC in this fic has a unique personality that adds a new dimension to the story.
One common theme is her relationships. Whether it's her relationship with her colleagues in the BAU or her family at home. Fan fictions often explore how these relationships shape her actions and decisions.
One common theme is the idea of resilience. JJ has to be strong and overcome the physical and mental challenges of being shot. For example, in many fanfics, she battles with post - trauma stress but still manages to come back to work.
Another theme could be JJ's own strength and resilience in the face of being hurt. Fanfics might explore how she copes with her physical or emotional pain and still tries to contribute to the team's work. Also, there could be themes related to the relationship between JJ and her family, especially how her being hurt affects them.
Another plot could be JJ's recovery. The fanfiction might focus on how she copes with the physical and emotional pain. It could show her going through therapy sessions, and her relationship with the team members getting closer as they support her during this tough time. For example, Garcia might bring her lots of goodies to cheer her up while she's in the hospital.
A frequent theme is the OC's integration into the BAU. Since it's an original character, the fanfic often focuses on how they fit into the team dynamic. They might face challenges from other team members or have to prove themselves. In relation to Rossi, the OC could also be involved in Rossi's personal life, like helping him deal with his past traumas or family issues. For example, in some fanfics, an OC might be a psychologist who helps Rossi come to terms with some of the darker aspects of his past cases.