Santorini: Tides of Poseidon contains 17 characters:

• Achilles
• Agamemnon
• Ares
• Charybdis
• Clio
• Echo
• Enodia
• Gaea
• Hephaestus
• Hippolyta
• Melpomene
• Moros
• Odysseus
• Poseidon
• Proteus
• Pythia
• Siren

It also contains 2 mode cards:

• Circe's Curse
• Trojan War