Actually, that would be covered by the way the pan-fandom characters come in!

The setup that we have going is that an Artifacty camera is bringing people into the 'verse. So when Gabe was/is pulled through, the camera would give him an actual body. (No, I haven't been thinking about this myself for the past ten minutes or so. Noooooooooope.)

A resident teenager would be awesome! It will annoy Artie!