Nothing that I have seen. But angels and demons do manifest as the Bible states many times. Tobit and Tobias talked with pure spirit. "Tobit and Tobias were terrified and fell to the ground, trembling with fear. 17 But Raphael said to them, Don't be afraid; everything is all right. Always remember to praise God. 18 He wanted me to come and help you; I did not come on my own. So sing God's praises as long as you live. 19 When you thought you saw me eating, I did not really eat anything; it only seemed so. 20 While you are on this earth, you must praise the Lord God and give him thanks. Now I must go back to him who sent me. Write down everything that has happened to you. 21 Then Raphael disappeared into the sky. Tobit and Tobias stood up, but they could no longer see him (Tobit 12)" Zachariah talked with a pure spirit. Zechariah said to the angel, “What proof is there for this? I’m an old man, and my wife is beyond her childbearing years.” 19 The angel answered him, “I’m Gabriel! I stand in God’s presence. God sent me to tell you this good news. 20 But because you didn’t believe what I said, you will be unable to talk until the day this happens. Everything will come true at the right time.” (Luke 1:5-2:20) And right afterwards "And in the sixth month, the angel Gabriel was sent from God into a city of Galilee, called Nazareth, 27 To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary. 28 And the angel being come in, said unto her: Hail, full of grace, the Lord is with thee: blessed art thou among women." (Luke 1)