HEAR ME OUT THE STRANGER IS A HIGHER BEING THAT'S BEEN SPOKEN TO IN THE PREVIOUS MOTHER SONGS (so hey god if you're up there, please take away this lot).
But as I'm updating this, I watched the intro of the lyric video for a clue: THE TOWER. "Here's my card."
An upside down tarot card. The devil. The stranger is definitely a divine being (also thank you very much for the jumpscare that appeared about 20 seconds earlier💀), but I'm not sure whether it's God (who she called out to in the Mother EP) or the devil (which is how he 'introduced' himself). I saw in the post beneath this that there were tarot cards mentioned which completely flew over my head, but i have a guide with what tarot cards mean so I'll give this song a 'read' lmao.
Yea that's a great theory!