Sentence:  However, even this great <WSD>hero</WSD> of the story is somewhat of a simpleton (when he lets himself be crucially deceived by Peacock Ravana in Vibhisana's shape), and a weakling (when in spite of all his strength he is almost beaten by his own son, one of the "rākṣasas") 
Meaning of the word marked with <WSD> tags:  The main protagonist in a work of fiction.