A scenario could be a missing person case that spans both areas. The NCIS LA team starts the investigation on the mainland when they realize the person might have headed to Hawaii. Then they call in the Hawaii 5 - 0 team for help. As they search, they discover that the missing person is involved in some sort of international conspiracy that both teams have to unravel.
Imagine a situation where a valuable artifact is stolen. It was on display in LA and was supposed to be shipped to a museum in Hawaii. The NCIS LA and Hawaii 5 - 0 teams have to work together to track down the thieves. Along the way, they encounter various obstacles like corrupt art dealers and hired mercenaries who are trying to keep the artifact for themselves. The two teams must use their wits and strength to overcome these challenges and recover the artifact.
In a crossover fanfiction, you could focus on the relationships between the characters. Perhaps there could be a bit of friendly rivalry at first between the two teams. But as they work together, they start to respect each other more. For instance, some of the more serious - minded characters from NCIS LA might initially clash with the more easy - going ones from Hawaii 5 - 0. However, by the end of the story, they become good friends and allies, having learned from each other's ways of doing things.
A possible plot could involve a missing person who has a connection to both Hawaii and LA's military. Hawaii Five - 0 starts the search in Hawaii and discovers that the person was last seen with some individuals who are under NCIS LA's surveillance. This leads to the two teams collaborating. They face many obstacles along the way, like interference from some powerful and shadowy organizations who don't want the person to be found.
One idea could be that a case starts in Hawaii and has connections to Los Angeles. The teams from both shows have to collaborate. Maybe a criminal organization is operating in both locations and they are smuggling some high - tech weapons. The characters from Hawaii Five 0 like Steve McGarrett could team up with the NCIS LA agents like G. Callen to take down the bad guys.
Common themes in these crossovers include the sharing of resources and expertise. The teams in 'Hawaii Five O' and 'NCIS LA' have different skills and technologies at their disposal. In the fanfiction, they combine these to take on powerful enemies. There can also be themes of cultural clashes and integrations. The Hawaiian culture in 'Hawaii Five O' is quite distinct from the more urban culture in 'NCIS LA'. Writers might explore how the characters from different backgrounds interact with each other, whether it's through misunderstandings at first or a newfound appreciation for each other's ways of doing things.
Kono Kalakaua would also be a great character to focus on. Her computer skills and her ability to handle herself in dangerous situations could be very useful in a crossover. Paired with Kensi Blye from NCIS LA, they could form a powerful female duo. They could share their experiences, compare their skills, and work together to solve the case.
One plot idea could be a joint case where the NCIS team and the NCIS LA team have to work together to solve a crime that spans across different locations. Maybe a terrorist threat that has connections in both Washington D.C. (where NCIS is based) and Los Angeles.
There are often fanfictions that focus on the relationships between the characters from the two shows. For example, a story could be about how an agent from NCIS Hawaii forms a friendship or a romantic connection with a detective from Hawaii 5 - 0 while working on a joint mission. They might start off not getting along but gradually learn to respect and rely on each other.
Another challenge could be the difference in resources and technology. They might use different equipment and have different access to information. For example, NCIS LA might have more advanced forensic technology due to their connection with the Navy, while Hawaii Five 0 might have more local knowledge and informants. Combining these resources effectively could be a struggle for the characters in the crossover.
One place to find such fanfiction could be Archive of Our Own (AO3). There are often many creative crossovers there. Just search for 'Hawaii Five O NCIS LA crossover' on the site and you'll likely discover a bunch of interesting stories written by fans who love both shows.
A plot could revolve around a character from one show being framed for a crime, and the other team has to step in to prove their innocence. For example, a member of the Five - 0 team is wrongly accused of stealing military secrets, and the NCIS Hawaii team uses their resources to dig deeper and find the real culprit. This could lead to some great character interactions as they learn to work together.