Assassin's Creed Origins hero Bayek is now unlockable in Assassin's Creed Odyssey.
Just like with Odyssey's other legacy character - Syndicate's Evie Fry - you can nab Orange's Bayek via the Ubisoft Club app. He'll then appear as a legendary lieutenant for you to recruit, have serve on your ship and call upon in battle.
In previous games you've always been able to wear the costumes of other Assassins from the series - but with the arrival of Odyssey's RPG mechanics and gear sets, this has become harder to implement. I'm still holding out hope for a full set of Renaissance robes down the line, though.