What type of figurative language is Johnny was scared his own shadow...?

The figurative language used in "Johnny was scared of his own shadow" is personification.

Here's why:

* Personification gives human qualities to non-human things.

* In this case, shadows are inanimate objects, but the sentence implies that Johnny is afraid of the shadow as if it were a living being that could harm him.

This phrase evokes a strong image of Johnny's extreme fear, making him seem almost childish or irrational.