However, here are some examples of figurative language from the books that could be considered idiomatic:
* "He had a face like thunder." This is a simile, comparing someone's expression to a storm cloud, implying anger.
* "He was as nervous as a long-tailed cat in a room full of rocking chairs." This is a simile that describes extreme nervousness.
* "He was so hungry he could eat a horse." This is a hyperbole, exaggerating the level of someone's hunger.
* "She was caught between a rock and a hard place." This is a proverb describing a difficult situation with no easy solution.
While these examples aren't strictly idioms, they all contribute to the richness and colorful language of the Percy Jackson series, giving the reader a deeper understanding of the characters and their experiences.