Kassandra is the canonically selected Eagle Bearer in Assassin's Creed Odyssey.
Odyssey lets players choose either Kassandra or Alexios as the playable character, while the other becomes Deimos. Ubisoft and associated series material identify Kassandra as the canonical protagonist for the game's historical storyline. She is a Spartan mercenary who travels through the Greek world during the Peloponnesian War.
The choice can make Alexios the player character in an individual playthrough, which is why the two names are sometimes treated as equally canonical. The game's branching dialogue and family story also include Myrrine and Deimos, but neither is the playable Eagle Bearer in the canonical version of the narrative.