She soon came to respect Luffy's qu

She soon came to respect Luffy's qualities as a leader, but often gets angry at his irrational thinking and short attention span. In such situations, she sometimes tends to get into violent outbreaks, often ordering him and the other members as well, even though he is the captain. Despite this, she cares for and trusts Luffy very much as her captain, and he often serves as an emotional anchor for her during times of crisis. In fact, she cried for Luffy when he lost his older brother in the Whitebeard War. Through his continued selfless actions prior to her official entry into the crew, Luffy has proven the most responsible for changing her opinion of pirates. When forced to leave the crew Nami knows that Luffy and the others will come and save her no matter what. Luffy and his crew consistently put themselves in the line of danger for the sake of helping others, including her, showing her that not all pirates simply act out of their own selfish ambitions without regards for others. Overall, she appears to be one of the crew members that respects Luffy the most, often saying "Luffy and the crew" when she is in danger. Nami is known to hug and hold onto Luffy when she upset or happy to see, him showing a they have affectionate brother-sister sort of relationship. When the pair need a quick getaway, Luffy will hoist Nami under his arm or over his shoulder and swing away on his stretched arm (though Nami is does not enjoy this mode of travel). Nami is also one of the people Luffy trusts the most as she is often given his Straw Hat to hold on to or wear when he fights. This has been seen in the Arlong Park, Drum Island, Jaya and Skypiea Arcs.
Though she respects him as a captain, Nami often scolds Luffy's airheadedness, but he never gets angry at her, even when she manipulates him. Luffy also has no problems taking orders from her when it comes to the navigation of the ship. Despite the slight conflict occurring because of his recklessness, she has deep trust in him and views him as a great source of strength and comfort. When Nami fell sick just prior to the Drum Island Arc, and without a doctor on board, Luffy desperately tried to help Nami the only way he knew how. He consistently stayed by her side, and attempted to get her to smile, becoming sad when he wasn't successful, trying to keep the promise he did to Genzo. When it was determined that the only way to get her treatment was actually climbing the Drum Mountains by foot, she implicitly trusted Luffy to get her there safely. Luffy barehandedly climbed the 5000 meter tall mountain to get her to a doctor, with enhanced pain caused by the reaction of rubber to cold.

Even though Nami betrayed him when she stole their ship and treasure during the chaos at Baratie, Luffy never changed his opinion of her, insisting that she become the navigator in his crew. Oddly, he seems to place the most trust in her out of all of his crewmates - after learning from Johnny that he witnessed Nami killing Usopp, he refused to believe him, even going so far as to threaten him with a beating for "lying". In a similar situation in Whiskey Peak, where he was told that Zoro had killed and hurt the people who fed him, Luffy outright attacked him, even though that information came from an unreliable source (unlike the case with Nami). While he is normally oblivious, Luffy is still occasionally weary of angering Nami. When he heard Absalom was going to marry her Luffy simply said "he want's marry Nami?, he's brave".

Even without knowing anything about the horrible past she suffered, seeing her cry was enough for Luffy to place his hat on her head to console her as he went berserk on Arlong and his crew, similarly to how Gol D. Roger acted. She's been so far the only one Luffy has directly given his hat to.