According to some, Michael the Archangel was keeper of the gate. Archangel means chief angel, this implies more than one. Michael was an archangel, he is a real spirit being. Michael had a title, and a name, so he must have had a personality. Adams body came from the ground but where did his spirit came from the world of spirits or heaven.
Christians generally accept the spirit of man as eternal.
The bible has references to them as being intelligent. Jacob wrestled with an angle. The sons of God that shouted for joy before the foundations of the earth were laid. A son can have only the image of his father. Angels and spirits look like people.