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i see your point but that also change friendship can turn into something different and the only reason im for it is because shes probably one of the only females close in age to luffy and has a close relationship with him name one other person he gave the hat to while it has a deep meaning none thats how everytime she got the hat was framed she was the first and he gave her it for any important promise to save her just like what shanks did for him and also to reassure on sky island that she is under the man that will become the pirate king just my thoughts
Nami worked for arlong only to be betrayed and she needed someone who get her back during that situation. I know oda goes metaphor with stuff because japanese language is filled with metaphor .
Luffy did not learn anything about namis past but he immediately assessed her situation . I think of it as moral support. I can be wrong if pairing does happen it needs good explanation why luffy actually likes nami .