Amazon is the gatekeeper of Skypiea, running the toll booth at the entrance to the island. She's known for being surprisingly laid-back about her job—she'll let people through even if they can't or won't pay, though she conveniently "forgets" to mention what happens to those who skip out on the toll. It's a shady move, but she doesn't really seem to care either way.
When the Straw Hats showed up, she made it clear she's not a fighter. She wouldn't stop them from entering if they refused to pay, and honestly, she seemed unbothered by the whole thing. She answered their questions, sure, but left out some pretty crucial details—like the fact that Skypiea uses a currency called Extol, or you know, the actual consequences of not settling your debt. Even when she found herself surrounded by panicked people fleeing to the Blue Sea, her calm barely flickered.
Content compiled by AnimeList.moe from publicly available sources.
