Along with Nico Robin, Nami is one of the smartest of the Straw Hats and the third smartest character during the East Blue saga according to Oda, the first being Ben Beckman of the Red-Haired pirates and the 2nd being Captain Kuro.[3] She is an excellent navigator and has the ability to recognize and analyze even the slightest changes in the weather, thus saving the ship and the crew from the very unstable Grand Line weather on multiple occasions. She is also in charge of the money the crew has.
She respects Luffy's qualities as a leader, but often gets angry of his irrational thinking and short attention span. In such situations, she sometimes tends to get into violent outbreaks. This may also be caused by traits of other crew members such as Roronoa Zoro's sleeping.
Nami is greedy and will do anything, aside from endangering her friends, for money. She also often takes advantage of Sanji for his devotion to her and Usopp to maintain her weapons. Roronoa Zoro tries not to fall for her schemes, but ends up a victim like the rest, usually due to debt. Nami also tries to avoid fights this way and will try to hide in groups or send others before her. However, since the invention of her clima tact (A weapon that forms weather patterns, also called the Weather Enforcer in the English dub), she is now seen fighting her own battles instead of becoming the 'easy target'.
Nami also has an obsession with fashion, as she is never seen wearing the same clothes. When Nami goes shopping, she sometimes goes to exquisite boutiques and tries on stuff, just to leave stating that she is searching for something more casual.
Her two favorite things are money and mikan (mandarin oranges) Her dream is to draw a perfect map of the world, a task not yet accomplished by anyone due to the harsh nature of the oceans in Grand Line. The first map Nami plotted was the island Cocoyashi village is on.