Dastardly Demigods
Odd Olympians
Petrifying Prophecies
Mythical Monsters
Troublesome Titans
100

This demigod takes the form of a pine tree upon her death before the beginning of the series.

Who is Thalia Grace? 

100

This Olympian is the father of the titular character. 

Who is Poseidon? 

100

"You shall be betrayed by one who calls you a friend" refers to this person who betrays Percy at the end of the first book.

Who is Luke Castellan? 
100

This monster imprisons Briares in Alcatraz.

Who is Kampê?

100

This titan is the main antagonist in the Percy Jackson and the Olympians series.

Who is Kronos? 

200

This demigod is driven mad by being sent into the Labyrinth.

Who is Chris Rodriguez? 
200

This Olympian only has one living child by the end of Percy Jackson and The Olympians.

Who is Dionysus?

200

The prophecy in The Titan's Curse foreshadows the death of these hunters.

Who are Bianca di Angelo and Zoë Nightshade?

200

This monster takes Annabeth as prisoner in The Titan's Curse.

What is a Manticore? 
200

This titan is commonly referred to as "The General" in his debut book. 

Who is Atlas?

300

This demigod pretends to be Clarisse La Rue in order to get the Ares Cabin to participate in the Battle of Manhattan.

Who is Silena Beauregard? 

300

This Olympian dislikes Annabeth after receiving an insult from her. 

Who is Hera? 

300
This line leads to the pact between the Big Three to not sire any demigod children.

What is "A half-blood of the eldest gods"? 

300

This fury attempts to kill Percy Jackson in the first book.

Who is Alecto? 

300

This titan prevents Poseidon from helping the rest of the Olympians keep Typhon at bay.

Who is Oceanus?

400

This demigod chooses to run away from Camp Half-Blood after the events of The Titan's Curse.

Who is Nico di Angelo? 

400

This Olympian helps Percy Jackson escape the skeleton warriors at the Hoover Dam.

Who is Athena? 

400

This person receives the line "But despair for your life entombed in stone.". 

Who is Clarisse La Rue? 

400

These are the two monsters that Clarisse was forced to sail her ironclad in between to get through the Sea of Monsters.

Who are Scylla and Charybdis? 
400

This titan faded after many of his roles were given to other gods when the Romans took over.

Who is Helios?

500

Percy Jackson takes this demigod with him to heal Annabeth after learning that she had been injured in the Battle of Manhattan.

Who is Will Solace? 

500

The young girl stoking the fire at Camp Half-Blood turns out to be this Olympian.

Who is Hestia? 

500

The destruction of the Labyrinth is foreshadowed by this prophecy line. 

What is "Destroy with a hero's final breath?"

500

The spoil of war from this monster looks like a golden brown duster due to the Mist.

What is the Nemean Lion? 

500

This titan complains about having to "babysit" Atlas instead of fighting in the Battle of Manhattan.

Who is Krios?