Although he claims that he is fearless I think he is afraid of not having any power because he was probably given a lot of power before they arrived on the island. After all, Jack is the head chorister so he was very strict with the choir boys even though they were probably thousands of miles away from their private school.
Chat with our AI personalities
Jack merridew! Jack merridew!
Jack didn't initially introduce himself, he simply asked "Where's the man with the trumpet?" It was only after Piggy babbled on about collecting names that he said, I quote... "Kids' names, " said Merridew. "Why should I be Jack? I'm Merridew."
Jack represents the defects of human nature that lead to the downfall of the boys on the island, savagery.
ralph to piggy
In the movie he is 4'11 and 90 pounds