Which of the following is a one-dimensional character and has very few traits?

flat

antagonist

round

protagonist

flat

A one-dimensional character who has very few traits is called a "flat" character.

The one-dimensional character that has very few traits is referred to as a "flat" character. To determine this, you can analyze the characteristics and development of the characters in a story or work of literature. Flat characters are usually straightforward and lack depth, often serving a single purpose or representing a particular stereotype. They do not undergo significant change or development throughout the narrative, which makes them less complex than other types of characters. By understanding the definition and criteria for a flat character, you can identify it among the options given and arrive at the correct answer. In this case, "flat" is the correct choice.