Kassandra is the canon protagonist of Assassin's Creed Odyssey's tie-in novel.
Odyssey allows players to choose either Kassandra or Alexios as the playable character. Ubisoft's official story continuity identifies Kassandra as the protagonist, while the other sibling appears as Deimos, a major character in the game's narrative. The novelization uses Kassandra's perspective and name.
The game is set in ancient Greece during the Peloponnesian War, beginning in 431 BCE. Kassandra is a descendant of King Leonidas I and can travel through regions such as Attica, Lakonia, Phokis, and the Aegean islands.
Because the game offers a character choice, players sometimes assume both siblings are equally canonical protagonists. The gameplay choice is real, but the tie-in novel and later series material establish Kassandra as the canonical character for the historical storyline.