Hamleton

This has been taken from Hamilton's Essential Literary Terms:

"A flat character, also called a two-dimensional character, is more a type than an individual, and stays essentially the same throughout the work...A round, or three-dimensional, character, in contrast, is multifaceted and subject to change and growth."

I thought of Hamlet when I read this.  I would consider Ophelia more of a flat character.  From the beginning, she is weak and stupid.  Hamlet drops hints for her that he still loves her but she is not smart enough to catch on.  She is also very dependant.  She depends on her father for direction as well as Hamlet.  She seems to not know how to care for herself.  This could be why she drowns herself when she thinks Hamlet wants nothing to do with her.  Hamlet, of course, is a round character.  He is very three-dimensional.  He starts off mourning.  He evolves into a vengeful person.  He also changes from a clever boy who feigns insanity to a boy he is possibly insane.  We are let inside Hamlet's head which I believe attributes to his three-dimensional appearance.