Character types and their functions

[blank_start]Flat[blank_end] characters do [blank_start]not[blank_end] change in any significant way over the course of a narrative. They are used to convey a particular quality or attitude in an [blank_start]obvious and straightforward[blank_end] way. Many of Charles Dickens' most memorable characters are flat characters and we remember them because they have become associated with a particular characteristic or idea. In contrast, [blank_start]rounded[blank_end] characters are [blank_start]complex[blank_end] and undergo [blank_start]significant[blank_end] changes in their outlook, temperament etc. . over the course of a narrative. Writers tend to use [blank_start]rounded[blank_end] characters for their main protagonist (character) as they are both more [blank_start]interesting and realistic[blank_end] which helps readers relate to them.

The character of the creature in Mary Shelly's novel Frankenstein is a flat character.

If you wanted to make your reader respond in a very particular way to your main character which narrative voice would it be best to use?