Dynamic characters: Scrooge in a Christmas Carol. He changes over the course of the story.
Round character is closely related to the dynamic character. It is a major, fluid character, who shows the capacity for change and development from the moment we meet them. Harry Potter is an example.
Flat character is a character with little to no complex emotions, motivations, or personality. They don't undergo change to make them more well-rounded. Sherlock Holmes from The adventures of Sherlock Holmes.
A static character is a type of character who experiences little to no internal change over the course of the story. Even as the plot develops, their personalities, beliefs, and characterization stay the same. Sherlock is also a static character.