Chopper

Chopper is naïve and extremely timid towards unfamiliar humans, often acting like a child because he does not know any better. Like Luffy, he is easily impressed at things like beams, cannons and hidden abilities. He is a coward at times like Usopp and Nami, although his cowardice can be attributed to his childishness and overall lack of trust in his own fighting skills (a contrast to Nami's self-survival-based cowardice and Usopp's insecurity-based cowardice). He would rather run and hide than fight but becomes more courageous when others are there to support him. Chopper is more or less on a journey to define himself, seeing almost anyone on his team as a role model and in some cases, imitate their behavior, especially Usopp. Being the youngest, Chopper is the most emotional Straw Hat and very much considers the crew his "family", when forced to be part of the Foxy Pirates during the Davy Back Fight Chopper was distraught and cried that he was a Straw Hat and only stopped bawling when Zoro ordered him to "man up". After the timeskip, Chopper seems to have grown more confident, much like Usopp. He no longer strives to be looked at as a human, now only wanting to "be a monster that can help Luffy" as he put it. He even has grown mature enough to smack his crewmates, mostly Zoro and Luffy, when they try to do something stupid or extreme. He also seems to have outgrown most habits mentioned above, but his habit of peeking still remains