Final answer:
Percy overhears his school principal in Chapter 2, not characters from ancient mythology or his peers.
Step-by-step explanation:
In Chapter 2 of the book, Percy overhears his school principal talking. This scenario occurs in Rick Riordan's book series, which features modern-day characters intertwined with ancient mythology. While the background references heroes like Perseus being fathered by Zeus, that context is separate from the specific events of Percy Jackson's story. Percy, like Perseus, is connected to ancient Greek gods, but his experiences are unique to the narrative crafted by Riordan.