A Latin Teacher - he works at Yancy Academy, and in most of the book he is known as "Chiron".
Percy's magical weapon, giving to him by his father. It looks like a ballpoint pen until you uncap it.
A Math Teacher - Worked at Yancy Academy and tried to kill Percy, afterwards he discovered that she is a Fury
A huge, strong bull man - the first monster that Percy fights. This monster kills his mother.
Percy Jackson's mother - "the best people have the rottenest luck" is used to describe her life in the book. In the end she comes back to life and freezes Gabe with Medusa's head!! wooohooo!
The reason we have spring and summer - she goes to Hades for winter and autumn, and she comes up for spring and summer.
"Aunty Em" - appeared as a nice Muslim lady wearing a head covering. She tried to change Annabeth, Percy, and Grover into statues with her eyes as she did many other people, but did not succeed.
The God of all things wild - disappeared years and years ago, and though many satyrs have gone to look for him, none have returned alive.