Zephyr is kinda adaptable so he would be awkward with Xipil but still give a slight smile and guide the conversation as long as Xipil is comfortable with it ( while hoping someone they're both friends with comes by).
With Metztli I feel like he'd ask just the right question to make her rant about something while nodding and open smiling.
And with Quetzalli he'd probably give her a candy or some snack, maybe sit in silence afterwards until he asks to play something.
For El, he doesn't talk directly to whoever it is during first meetings until he finds them somewhat trustable. After that he's kinda like a comfort friend, anyone can lean on him (shorty) and he doesn't mind being left out of conversation as long as he's present.