>>3755300
That's Octopath 1.
They interact in banters (only available in ch2 onwards) and tavern banters (after ch4 I think) provided they're in the active party in certain points of their corresponding stories.
OT2 follows the same general format with banters appearing in ch2 onwards, but they also have paired chapters (crossed paths) where two of the 8 do some stuff together for 2 mini-filler chapters, all of which lead to the final chapter - which OT1 does not have.