Kassandra is the Spartan mercenary protagonist established by Assassin's Creed Odyssey's canon novelization.
Odyssey allows players to choose between Kassandra and Alexios as the playable character. The game presents both as siblings connected to the royal family of Sparta, but the novel adaptation by Gordon Doherty identifies Kassandra as the canonical protagonist for the story.
Set in 431 BCE during the Peloponnesian War, Odyssey follows the chosen mercenary across the Greek world. The narrative includes Athens, Sparta, the Aegean islands, and encounters with figures such as Pericles, Socrates, and Herodotus. Its mythological elements connect the historical adventure to the broader Isu lore.
Alexios remains a valid playable choice in the game itself, which is why the character selection can cause confusion. Kassandra's canonical status comes specifically from the official novelization and related franchise continuity, not from every player's individual game experience.