Suggestions by @mr95

Chimera

as Chimera in Percy Jackson: The Lightning Thief

Jacqueline Harris Matherne

as Echidna in Percy Jackson: The Lightning Thief

Nicole Gale Anderson

as Medusa in Percy Jackson: The Lightning Thief

Hellhound

as Hellhound in Percy Jackson: The Lightning Thief

Minotaur

as Minotaur in Percy Jackson: The Lightning Thief

Glenn Close

as Alecto in Percy Jackson: The Lightning Thief

Patrick Page

as Kronos in Percy Jackson: The Lightning Thief

Mustafa Shakir

as Zeus in Percy Jackson: The Lightning Thief

Oded Fehr

as Hades in Percy Jackson: The Lightning Thief

Lewis Tan

as Ares in Percy Jackson: The Lightning Thief

Peter Franzén

as Poseidon in Percy Jackson: The Lightning Thief

Gabriel Iglesias

as Dionysus in Percy Jackson: The Lightning Thief

Future

as Charon in Percy Jackson: The Lightning Thief

Danny Griffin

as Argus in Percy Jackson: The Lightning Thief

Patricia Reyes Spíndola

as Fates in Percy Jackson: The Lightning Thief

Cassi Davis

as Fates in Percy Jackson: The Lightning Thief

Frances McDormand

as Fates in Percy Jackson: The Lightning Thief

Jun Kunimura

as Chiron in Percy Jackson: The Lightning Thief

Emily Blunt

as Sally Jackson in Percy Jackson: The Lightning Thief

Matt Berry

as Gabe Ugliano in Percy Jackson: The Lightning Thief