Chopper often acts very childish because he is innocent and does not know any better. Besides being naïve, he is also extremely shy towards strange humans, especially before meeting the crew. he is sometimes a coward but his cowardice can be attributed to his childishness and low confidence in his own fighting abilities, which contrasts with both Nami's cowardice based on her self-survival and with Usopp's cowardice based on his insecurities. he is always easily impressed at things. Panics Quick