He seems to be willing to help others, as he is a doctor, and is probably brave, as he joined the others to try and defeat Arlong, even though he knew he was going to die.[2] He seems a bit grumpy, as he was dumbfounded and angry that Luffy did not have a doctor in his crew to treat any serious wounds that they had, such as the wounds of Zoro.[3] He is otherwise a good doctor and very caring of Nami.