What are the archetypes in The Lightning Thief?

Answer 1

Archetypes are basically monsters. If you kill them, eventually they reform and continue living. In that series, several archetypes are Mrs. Dodds (a Fury) and the Minotaur. "'Monsters don't die, Percy. They can be killed, but they don't die.'

'Oh, thanks. That clears it up.'

'They don't have souls, like you and me. You can dispel them for a while, maybe even a whole lifetime, if you're lucky. But they are primal forces. Chiron calls them archetypes. Eventually, they re-form.' (The Lighting Thief, page 86)"

Answer 2

Medusa, The Land of the Lotus Eaters, and the Chimera. Medusa, The Land of the Lotus Eaters, and the Chimera.