Yes, he is the Main Bad Guy.
yes
Nico does not have a tiger in the Percy Jackson books.
The books of Percy Jackson. Nice.
Tyson
You mean Percy Jackson and the Olympians?
The "Big Three" in the Percy Jackson books, are referring to the three main gods, Zeus Lord of the Sky, Posiden Lord of the Seas, and Hades Lord of the Underworld. They are the Big Three, because they have supreme power, and are the sons of the Titan, Kronos.
The main villain in the first five books is Kronos.
No Hestia is not in the Percy Jackson movie only the books.
the Percy Jackson books
You can get Percy Jackson books at most bookstores, depending on your location. You can also buy them online. (see related links)
No, it is the first book in the Percy Jackson and the Olympians series.
The author of all Percy Jackson books is Rick Riordan.