Robin's character develops through her interactions with the Straw Hat crew. At first, she was more reserved due to her past traumas. But as she spends time with the crew, she starts to open up and trust them more. Her development is also seen in how she becomes more confident in using her abilities to help the crew in their adventures.
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Their relationship could start with distrust. Aokiji being a former Marine and Robin being a wanted archaeologist. But as they interact more, they might find common ground in their search for truth. Maybe they start to share stories about their pasts, which slowly builds a bond between them.
Robin's character is quite similar in both. The core traits and personality remain consistent.
During time travel, Luffy and Robin might discover new sides of each other. Luffy could see Robin's more vulnerable side when she is faced with historical events that are related to her past and her people. Robin, on the other hand, would be in awe of Luffy's ability to adapt so quickly to any situation in different time periods. This mutual understanding and discovery could lead to a deeper bond between them. They might also share some quiet moments where Robin tells Luffy more about the history she has studied, and Luffy listens intently, strengthening their connection.
Well, often in fanfiction, Luffy's pure - hearted nature brings Nami and Robin closer to him. Nami may be portrayed as more protective of Luffy in these stories, while Robin could be more like a guiding figure for Luffy's growth. For example, Robin might help Luffy understand some complex historical or cultural aspects related to the One Piece world, and Nami could use her navigation skills to lead the crew to places that help Luffy achieve his goals of finding the One Piece.
She would likely become more open. At first, young Robin might be reserved due to her past experiences. But as she spends time with the Straw Hats, she'll start to share more about herself. For example, she could gradually open up about her family and her dreams for the future. Her confidence would also grow. The Straw Hats' acceptance and support would make her believe in herself more. She might become bolder in using her skills, like when exploring dangerous ruins or facing powerful enemies.
Batman becomes more brooding. He's less likely to trust others and more likely to take on dangerous tasks alone.
Naruto could start off as a bit of an outcast in the One Piece world, but as he makes friends with the Straw Hats, he learns to adapt. His development might involve him becoming more understanding of the different cultures and powers in the One Piece universe.
In some harem fanfictions, Luffy may develop more emotional intelligence. For example, he has to understand the feelings of the different girls in his harem. He might become more perceptive about relationships compared to his rather straightforward self in the original series.
During the timeskip, Nami gains new knowledge and tools for navigation. She also shows more determination and courage in facing challenges. Her appearance changes a bit too, reflecting her growth. All these developments make her an even more important member of the crew.