All original Octopath Traveler companion locations in Octopath Traveler 0
via polygon.com
Short excerpt below. Read at the original source.
You can recruit the characters from Octopath Traveler in Octopath Traveler 0 and make use of the classic group that began it all in this new game. This is only possible because the story of Octopath Traveler 0 takes place in Orsterra, the same continent as the first game.