Santorini: Soaring over Olympus contains 17 characters:

Aeolus

Aloadae

Boreas

Daedalus

Eirene

Europa & Talus

Gryphus

Harpies

Helios

Heracles

Hermes

Hesperides

Nike

Pleiades

Polyhymnia

Selene

Stymphalians

It also contains 2 mode cards:

Harmonia's Test

Chimera's Flight