Sherlock Holmes would be an excellent choice. His deductive reasoning skills combined with the resources and local knowledge of the 'Hawaii Five O' team would make for an amazing story. The clash of Holmes' eccentric personality with the more laid - back Hawaiian vibes could also create some humorous and interesting moments.
The characters would have a mix of interactions. Tony from NCIS would likely be flirting with some of the female characters from Hawaii Five - 0, which could get him in trouble with both teams. Abby from NCIS would be excited to see the different forensic techniques used in Hawaii. The more by - the - book approach of NCIS would contrast with the more street - smart style of Hawaii Five - 0. For instance, when interviewing suspects, NCIS might rely more on formal interrogation, while Hawaii Five - 0 might use their local knowledge and charm to get information. And as the story progresses, they would all learn from each other's methods and form a stronger bond to solve the case.
Steve McGarrett is a great character to focus on. He's the leader of the team, with a strong sense of justice and a lot of backstory to explore, like his military past. Another good one is Danny Williams. His banter with Steve adds humor to the show, and his family - man side gives room for some emotional depth in a fanfic. Kono Kalakaua is also interesting. She's a strong female character with her own set of skills and a connection to Hawaiian culture that can be delved into.
Well, Gibbs would likely be very no - nonsense. He might initially be a bit skeptical of the more laid - back approach of the Hawaii Five 0 team. For example, he might not understand why they take time to enjoy the Hawaiian scenery while on a case. But as they work together, he'd come to respect their local knowledge. On the other hand, McGarrett would probably be impressed by NCIS's resources. He'd be eager to learn from them and use their high - tech tools to solve the case.
I think Jane Tennant from NCIS Hawaii and Steve McGarrett from Five - 0 would be an interesting pair. They are both strong leaders, and it would be fascinating to see how they handle a case together. They could clash at first due to their different leadership styles, but then find common ground and respect for each other as they work towards solving the mystery.
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.
Well, first of all, the family and friends of Grace in the fanfiction would be in a state of panic. The Hawaii Five - O team would split up to cover more ground. Some might be looking into her personal life to see if there are any possible motives for the kidnapping. Others would be out on the streets, asking around and showing her picture. They would also be coordinating with other law enforcement agencies in case the kidnappers try to take her off the island.
A time - travel crossover fanfiction could be really exciting. Maybe a character from 'Hawaii Five O' travels back in time and has to work with a past version of the team to prevent a major event that would change the future of Hawaii. This would involve a lot of research into the history of the area and could create some really interesting scenarios.
Steve McGarrett from 'Hawaii Five - O' and Oliver Queen from 'Arrow' would make an excellent team - up. Steve is a tough and no - nonsense detective, while Oliver has his own brand of vigilante justice. Together, they could combine their skills to take on the Al Ghoul threat. Also, Kono from 'Hawaii Five - O' and Felicity from 'Arrow' could be a great pair. Kono is tech - savvy and Felicity is a brilliant hacker, so they could work together on the technological aspects of the case.
I think Alucard from Hellsing would be an interesting character to cross over with Trigun. Alucard is a powerful vampire with a dark and complex personality. If he were to enter the world of Trigun, his power level would be a major factor. He could either be a great ally or a terrifying foe to Vash, depending on how the story unfolds.
Another interesting pair could be Kono Kalakaua from Hawaii Five - 0 and Castiel from Supernatural. Kono is a strong and independent woman, and Castiel is an angel. The contrast between her human skills and his celestial powers would be fascinating. Maybe Kono is in trouble while on a case and Castiel swoops in to save her, and then they have to work together to stop an evil force that is threatening both the human and supernatural worlds in Hawaii.