Question

Why shouldn’t a story have all round characters or all flat characters?

Answer 1

if a story is filled with flat characters it'll be boring.

But if you add all round characters it'll be too long as you'd have to show the character development of all the characters.

Keeping a mix of both type of characters make the story well written and interesting.

Readers enjoy a story in which a character goes through change in their personality. So having at least one round character is necessary.

the main characters are usually the round characters and the other characters are flat.

Answer 2

A flat character attempting to fill the shoes of a main character will make for a lackluster reading experience. But not all characters need to be round. ... To make him a round character would take the attention away from her experience, overshadowing what's important in the scene.

Step-by-step explanation: