Isis would absolutely adore Metatron and I think they should be friends. /bossy. Mostly because they both share a never-ending love and comfortable determination. She promises to try and help him with his back problems? Tea? o3o And Zelus she will avoid. Sorry bro.
Psyche would know Zelus from MMA and she'd either find him incredibly amusing/interesting or absolutely loathe him. It depends on the day and her mood. Whenever he made her mad, too, she probably felt comfortable enough to full-out attack him in her rage. Metatron~ Why you so calm? He'd make Psyche just slightly uncomfortable and out of place. She's too much of a child to appreciate his awesome. But she does think he's all sorts of sexy. (Just don't tell him that.)
Ren will be Ren? Piss of Zelus by making remarks about his sister? Be super hyperactive and jealous with him?
Baldr wants to be your friend, too, Metatron. He is also obsessed wiht watching people and is very chill. But he's not so willing to be forgiving of his pantheon homies. >: