The OC could be a new detective on the team. Steve is initially skeptical of their abilities but as they work together on various cases, he starts to respect and even develop feelings for them. For example, during a high - stakes hostage situation, the OC comes up with a brilliant plan that saves the day, winning Steve's admiration.
Let the OC have their own goals and motives that are not solely centered around Steve. They could be on a mission to clear their family's name or to expose a big conspiracy in Hawaii. By having their own independent story arc, the OC becomes a more well - rounded and strong character in the fanfiction.
Perhaps Steve gets hurt during an underwater mission. He could be attacked by some sort of sea creature or caught in a dangerous underwater current. His team would then have to deal with his absence and also figure out how to complete the mission without him. Meanwhile, Steve is in the hospital, frustrated at not being able to help, and has to rely on his mental strength to stay positive during his recovery.
One plot idea could be that Steve McGarrett is forced to participate in a drinking game during an undercover operation at a local bar. He has to pretend to be a regular customer and play along without blowing his cover. Another idea is that his friends on the team challenge him to a drinking game to unwind after a tough case, and it leads to some hilarious and heart - warming revelations about their relationships. Or perhaps in a more serious vein, a villain challenges Steve to a drinking game as part of a dangerous bet, with high stakes for the safety of the island.
A possible plot could be that Kono and Steve are trying to keep the pregnancy a secret from the bad guys they are investigating. They fear that the criminals might use Kono's pregnancy as a way to get to them. So they have to be extra careful in their daily lives and on missions.
One great Steve McGarrett OC fanfiction could be 'A New Ally for McGarrett'. It creates an interesting original character who has a unique backstory and then gets involved in McGarrett's world of crime - fighting in Hawaii. The character development is really well - done, making it a great read.
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.
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.
A more emotional plot could be Kono dealing with the fear and excitement of becoming a mother while also being in a high - stress job. She could be worried about how her child will grow up with her being in a dangerous line of work, and she has to balance her career and motherhood dreams.
One idea could be a crossover with 'Magnum P.I.'. The characters from 'Hawaii Five 0' could team up with Magnum to solve a crime that spans across different parts of Hawaii. Maybe it involves a smuggling ring that has connections to both the military and local crime syndicates.
One common storyline could be Steve McGarrett being protective. In the fanfiction, he might find out about the pregnancy and immediately go into a protective mode, ensuring the safety of the pregnant character. He could be seen arranging security, getting medical help, and just being there for every need.