At the beginning of Lord of the Flies, we find out about one of the main characters, whose foremost feature is that he is "different from the other boys".

foremost 是由 fore（前面的、首要的）和 most（最）组成的复合词，字面意思是"最前面的"，引申为"最重要的、首要的"。 在句中指这个角色最突出、最显著的特征。