During E3 2018 Ubisoft announced there will be two leading protagonists in Assassin's Creed Odyssey. These are Alexios and Kassandra, and you'll choose which one you want to play as at the very beginning of the game. The novelisation of the game, however, will only tell one story.
In a recent Reddit AMA, AC Odyssey creative director Jonathan Dumont revealed that in the Assassin's Creed Odyssey companion novel, the authors would be opting to go with Kassandra as the sole protagonist.
"Yes there will be a canon represented in the novel. It features Kassandra and her journey. But in the game you decide your path, there is no right or wrong way", said Dumont, in a response to whether there would be a canon protagonist in Assassin's Creed Odyssey.
This means that although Kassandra will be the choice protagonist for the novel, both her and Alexios are still on equal footing for the Assassin's Creed Odyssey game. You're free to choose which character you want to play as at the beginning, and Ubisoft has always been keen to stress that there are fully formed main quest lines for each protagonist, so one isn't more valid than the other.
Assassin's Creed Odyssey is all set to release for PC, PS4, and Xbox One on October 5, 2018. For everything you need to know on the upcoming Greek adventure game, head over to our complete Assassin's Creed Odyssey everything we know guide.