A frequent theme in Criminal Minds time travel fanfiction is exploring the past of the characters themselves. For example, we might see Reid going back to his childhood and changing some things that affected his development. Also, the theme of alternate realities often pops up. The time travel can create different timelines where the team has to figure out how to get back to their original reality while also solving crimes in the new one. This makes for some really complex and interesting plots.
Another theme is the transformation of the characters. Sometimes, a character from Criminal Minds might be turned into a vampire or be influenced by vampire powers. This leads to internal conflicts within the character and also changes their relationships with the rest of the team.
Often, there's the theme of fear and anticipation. Pregnancy brings a lot of unknowns, especially in a dangerous world like the one in Criminal Minds. The pregnant character might be afraid for the safety of their unborn child, considering the kind of criminals they deal with. There's also the theme of change. A pregnancy can change the character's relationships not only with their colleagues but also with themselves as they take on a new role as a mother - to - be.
One common theme is the psychological exploration of the characters. Since the show is about criminal profiling, fanfics often go deeper into the minds of the BAU agents. Another theme is the relationships between the team members, like their friendships and how they support each other during tough cases.
One common theme is the exploration of the criminal mind itself. It often delves into what makes a criminal tick, like their motives which could be revenge, greed, or power. Another theme is the pursuit of justice by the investigators. They use their skills in profiling, forensics, and detective work to catch the bad guys. Also, the psychological impact on the victims and their families is a theme. We see how they cope or sometimes fail to cope with the trauma.
One common theme is the aftermath of a traumatic case. The characters often struggle with the emotional toll it takes, like nightmares or self - doubt. Another theme is physical injury and the process of recovery, both physically and mentally. For example, a character might get shot and then have to deal with the fear of going back into the field.
Another theme is Reid's own personal growth during the ordeal. He may face his fears, or learn something new about himself. For example, in some fanfictions, he discovers a new level of strength or resilience that he didn't know he had while being kidnapped.
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.
One common theme is friendship. The group chat allows the characters from the BAU team to show their friendship outside of casework, like sharing daily life updates or just joking around.
One common theme is the combination of psychological profiling from 'Criminal Minds' and forensic evidence analysis from 'CSI'. Writers often use this to create a more comprehensive approach to solving crimes in the fanfiction. For instance, the BAU team might use their profiling skills to narrow down suspects, while the CSI team uses their evidence to confirm or refute the profiles.
The theme of redemption can also be found. Just as some characters in Naruto seek redemption for their past actions, in the context of Criminal Minds investigations, the idea of criminals seeking redemption or the characters in the Criminal Minds team dealing with their own past traumas while trying to bring about justice can be explored. It adds an extra layer of depth to the crossovers.