Talking to each other I think could be tricky (would suggest taking your eyes off the battle on the center stage to read a bit, which could break concentration and all, but not reading it would also feel like a loss of content, so the player comes out feeling like they're losing something either way) but making faces in response is great. For interactions, I prefer it when it's between missions, or just having a "FILES" option in the main menu or title screen that lets me read/watch/listen to conversations, facts and such information.
Will be looking forward to seeing more of these little guys!