Nami is the navigator of the Straw Hat Pirates and one of the most important members of Luffy's crew. She joined up with him during the Orange Town arc, however, it wasn't until after the events of the Arlong Park arc that she truly became a member of the crew. As one of the five main characters from the East Blue, Nami is exceptionally important to the plot.
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As the navigator, she's the only one who can ensure that Luffy gets to Laugh Tale safely. However, that's not all that she does. Nami is also a competent fighter, although among the weakest in the crew. She mainly makes use of her wits in combat to get the better of her enemies. Surprisingly, One Piece 1058 showcased her using Conqueror's Haki in what appeared to be a gag scene. The question remains, however, could Nami possess this power?
As fans know, Nami doesn't wield any form of Haki in the story so far. Haki is a power that Rayleigh described to be the manifestation of the user's spirit. Every person in the One Piece world possesses Haki, however, not everyone is able to bring this latent skill out. Once awakened to it, Haki can be manifested as the Color of Observation and the Color of Armament.
The Color of Observation grants a certain sixth sense to the user and allows them to sense things like incoming danger, power levels, intent, and emotions, among many other things. The Color of Armament, on the other hand, allows them to manifest their spirit and use it as armor, to both attack and defend. Nami possesses neither of these abilities. Strangely enough, she's able to hurt Luffy whenever she gets mad at him despite the latter being made of rubber.
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