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