My own view incorporates the ideas of Carl Jung, which saw such figures as emanating from the collective unconscious, but does that understanding go deep enough? Jung argued that people in the twentieth century were more likely to see aliens than angels or devils because that is more in line with the mythical atmosphere of our times. I am not sure if there has been much philosophy discussion of the topic of angels, demons and spirit guides. That may be because academic philosophers do not take the idea seriously at all. However, in bookshops there are so many published books on the topic in the section of 'Mind, Body and Spirit', indicating that such ideas are extremely strong in the popular imagination.