At the end of the Omega story, Alpha and his wind-up toy of Omega leave to explore the world. There's a cutscene of them exploring the Fringes and getting into small misadventures. After that, they can occasionally be found in various places out in the world map, just hanging out and seeing the sights. I've seen them in a few places, like the campfire outside Moghome in the Churning Mists, the cliff's edge in the Behemoth's Domain in Central Coerthas, or in the kitchens at Revenant's Toll (which is the only one I seem to have a screenshot of). They can't be interacted with, but it was a nice little Easter egg.
I was kinda hoping they'd do something similar with Meteion. Just have her bird form out seeing the world.