Question

Why does aristotle give importance to plot and character in tragedy?

Answer 1

Because Aristotle defined tragedy as mimesis, loosely translated as the "imitation of action," and this action must be either probable or necessary, and it must have serious implications and be complete.

The primary principle of tragedy, given Aristotle's argument that tragedy imitates action, is the plot, which he defines simply as how the author arranges incidents--not the story itself but how the author presents plot elements to the audience:

But most important of all...