Kassandra is the canon protagonist in Assassin's Creed Odyssey's official novelization.
Odyssey allows players to choose between Kassandra and Alexios as the playable protagonist. Ubisoft's official tie-in novel, written by Gordon Doherty, follows Kassandra, establishing her as the canon version for that adaptation and for the game's broader narrative continuity.
The story is set in the Greek world during the Peloponnesian War. Kassandra is a Spartan misthios whose journey involves family conflict, ancient secrets, and the Cult of Kosmos. Alexios remains a valid playable option in the game, but the two choices do not have equal status in the official novel's version of events.
Deimos is a separate character in the family storyline, and Myrrine is Kassandra's mother. These names can cause confusion because they are all closely tied to the central plot. The canon choice does not prevent players from selecting Alexios in their own game.