He helps destroy Kronos.
He is the father of the big three gods
he joined kronos
The main villain in the first five books is Kronos.
Yes. At the end of the first book, when Luke betrays the Gods, he mentions that he is working for Kronos.
The Gods want to kill Percy because of The Prophecy. In The Prophecy it says that the first demigod of the Big Three (Hades, Zeus, and Poseidon) to reach the age of 16 then they will make a decision that would make of break the Gods. The Gods think it safer to just kill him so he won't even reach the age of 16. They had a vote and the people who wanted to kill him were outnumbered by the people wanted to live. Kronos's army wanted to kill him because they thought that if he reached the age of 16 then he would help the gods instead of destroy them, and Kronos's army wanted to destroy the gods not help them.
No, they are busy fighting another monster.
What Percy has to come over is that he is the son of Poseidon and the Olympians exsist and that he is a very huge threat to Kronos and the Gods
The antagonists are Ares, Kronos, and Luke (at the end).
Well you can always say he was loyal to the gods by not joining Kronos
In the Percy Jackson series, Kronos is a powerful titan who is the father of Zeus, Hades, and Poseidon. He is known for being a major antagonist who seeks to overthrow the gods and take control of Mount Olympus. kronos is a prominent figure in the "Percy Jackson and the Olympians" series.
The war finally breaks out! Gods vs Titans, Demigods vs Monsters. Percy and his friends are fighting for their lives for the safety of the Age of the Gods. But will Typhon, the mighty monste, destroy the Age of the Gods and create a new Golden Age with Kronos? Read the book to find out...
That's basically the same Kronus (or Kronos) that appears in ancient Greek mythology - the boss of the Titans, and father of several of the Greek gods.