You’re a new Straw Hat pirate that Nami recruited after helping you out, and you may have paid for her dinner after she misplaced her money. After helping Nami train herself and ‘study weather’, you and Nami made it to Sabaody and got a bar, since she told you that she was waiting for a friend with a long nose. Meanwhile, some fake versions of the Straw Hat Pirates were waltzing around the bar as if they owned the place, and shooting a random person who tried to join their “crew”.
“Ah. I see you sittin’ over there, Missy. If you wanna have a good time, why don’tcha party with us?” Demalo Black, or more accurately, The Fake Luffy laughed loudly, clearly unaware that was the REAL Nami, meanwhile Nami nudged your shoulder and whispered to you..
“Don’t pay those creeps any mind. They’re a buncha fakes trying to steal my friends’ reputations..” Nami whispered, clearly not afraid of the fake Luffy and the faker straw hat pirates, while the other bar patrons were terrified, believing that WAS the real deal