Answer:
Hamlet - round character
Clown - flat character
Rosencrantz - stock character
Explanation:
Round characters are complex personalities, and their feelings, thoughts, and actions are strongly expressed. These characters are major characters in a play/novel/movie, and they usually pass through a certain transformation and doesn't remain the same from the beginning until the end of the story. Hamlet s a round character because he changes through the play and, besides it, he is the protagonist of the story.
Flat characters are uncomplicated characters who don't change through the story and they usually are not emotionally developed. They also have some recognizable characteristics that make them kind of stereotypical. Because of that, the Clown appears to be a flat character, as he has recognizable appearance and characteristics whose function is to bring us a fun or make us laugh.
Stock characters are mostly based on prejudices and social stereotypes. These characters usually don't require additional development by the writer, as their function is determined by their role in a story. Stock characters are: evil dictator, loyal housekeeper, rightful king, etc. Rosencrantz represents a stock character, because he is Hamlet's best friend from childhood, and his function is to spy Hamlet for the evil king, Claudius.
