Well, a major theme is the exploration of Robin's past and her connection to the Void Century. The oc can play a role in either helping her uncover more about it or being a part of the story related to it. Another common theme is the power dynamics within the Straw Hat crew. The oc's relationship with Robin can be influenced by how they fit into the crew's hierarchy. And of course, there's the theme of loyalty. The oc and Robin might have to prove their loyalty to each other and to the crew during difficult times.
The theme of growth is quite prevalent. The oc might start off as a weak or inexperienced character and through their interactions with Robin, grow in strength and knowledge. Romance is also a common theme. Writers often explore the relationship between the oc and Robin, from the initial attraction to a full - blown love story. Additionally, the theme of redemption can be found in some fanfics. Maybe the oc has a troubled past and Robin helps them find a new path in life.
Another theme is the exploration of Robin's past. The OC can be used as a tool to dig deeper into Robin's history as an archaeologist and her experiences growing up. They could go on quests to find more about her lost heritage or the secrets of the Poneglyphs. This adds more depth to Robin's character.
Adventure is a very common theme. Since Nami and Robin are part of the Straw Hat crew in One Piece, many fanfictions involve the OC joining them on their adventures in the Grand Line. For example, they might go on a quest for a lost treasure or to discover a new island.
One common theme could be the exploration of how Nico Robin's character changes during pregnancy. Given her complex backstory in One Piece, it might focus on her dealing with new emotions and insecurities. Another theme could be the reactions of her crewmates, like how Luffy and the others support her through this new phase of life.
One common plot element is the oc having a special ability or knowledge that intrigues Robin. For example, the oc might be an expert in ancient languages, which catches Robin's attention as she has her own interest in history and archaeology.
One idea could be that the OC is a new pirate who joins the Straw Hats. Over time, they develop a special bond with Nico Robin due to their shared interest in ancient history. Meanwhile, during an encounter with Boa Hancock, the OC manages to gain her respect in an unexpected way, like saving her from a new threat in the Grand Line. This could lead to a complex love triangle where the OC has to navigate their feelings for both strong - willed women.
The combination of an original character (OC) with Nico Robin in a harem setup is interesting because it allows for a lot of creative freedom. Writers can create unique personalities for the OC that either complement or contrast with Robin's character, leading to interesting interactions.
One common theme is the power - dynamic. Naruto has his own set of powers and Robin has hers. Fanfictions might play with how these powers interact or complement each other. Another theme could be about cultural exchange, as Naruto's world and Robin's world in One Piece have different cultures.
Adventure is also a big theme. Since they are part of the Straw Hat Pirates, fanfictions often show them facing new challenges and exploring new islands together. Their relationship blossoms during these adventures as they rely on each other's strengths.
One common theme is adventure. Since they are both from the One Piece world which is full of adventures, fanfictions often put them in new and exciting adventures together. They might explore uncharted islands or face new and powerful enemies.
One common theme is her search for knowledge. Since she is an archaeologist in the original series, many fanfictions expand on her thirst for learning about the world's history. For example, stories might have her discover long - lost civilizations.