Smee is a weak character, often seen rushed around by his captain. Even though his captain gives him a lot of trouble, he is very loyal to him. He is clumsy, goofy, and unlike his captain, he's very kind.
Smee is a very cowardly character. To Captain Hook, he is an imbecile, but he only screws up a lot because his great fear of Hook causes him to try a little too hard to do things right, leading them to go wrong. Despite his bumbling persona, he is Hook's only loyal man as the other pirates can be seen early in the film throwing knives and darts at the cabin door with a crude drawing of Hook on it with "the captain" written above it. Despite the constant abuse from Captain Hook, Smee never thinks twice when it comes to rescuing his captain from several dangers including the crocodile attacks. This is a prime example of Smee's astonishing loyalty.
Smee has that bumbling way about him. He’s always trying to keep up and wants to try to make everybody happy—like the Mom who wants everybody to stop fighting and be friends and make nice and for the world to be every color of the rainbow. But every once in a while, you’ll hear—and I try not to do it too often—that little edge of “Boy, this job is really hard and I am a little tired of it. - Jeff Bennet on Smee.