Rufy's main character traits are naivety and fearlessness.He gets excited about trivial things and is confused by basic concepts. If he does not understand something that is explained to him, he begins to call it "a great mystery" even though he is the only one who does not understand.His simple mind has actually saved him from Hancock's powers, which can petrify anyone who thinks lustful thoughts. He has no knowledge of medicine.Oda revealed that he has thought of Rufy's character so that he is always outspoken about what he wants and how he feels.