Angels are huge and powerful beings.
There are many different types of angels. Angels do not all look alike. Angels take on many appearances: They can be the blaze of a crackling brush fire, the flame of a slim wax candle, the wind rattling against the windows or the gust of a winter storm, the flashes of dancing color, a snake in the tree, or angels can be in your very midst sitting next to you on the airplane, subway, bus or train looking like regular people.
Heb 13:2 Be not forgetful to entertain strangers: for thereby some have entertained angels unawares. KJV
Even though people have said they have seen female angels the bible teaches us that angels are genderless. Jesus taught that in heaven men will be like angels and have no gender. So we cannot call an angel a male or a female in that sense; but some do appear as males and some appear as females. They have different appearances but they are not male or female per se.
In Hebrews chapter 1 we read some of the angels are winds and so when they are around you, you could feel like a wind blowing by you. God has also made angels flames of fire.
Some angels are very strange looking creatures like “the living creatures” angels.
Ezek 1:5-14 Also out of the midst thereof came the likeness of four living creatures. And this was their appearance; they had the likeness of a man.
6 And every one had four faces, and every one had four wings.
7 And their feet were straight feet; and the sole of their feet was like the sole of a calf's foot: and they sparkled like the colour of burnished brass.
8 And they had the hands of a man under their wings on their four sides; and they four had their faces and their wings.
9 Their wings were joined one to another; they turned not when they went; they went every one straight forward.
10 As for the likeness of their faces, they four had the face of a man, and the face of a lion, on the right side: and they four had the face of an ox on the left side; they four also had the face of an eagle.
11 Thus were their faces: and their wings were stretched upward; two wings of every one were joined one to another, and two covered their bodies.
12 And they went every one straight forward: whither the spirit was to go, they went; and they turned not when they went.
13 As for the likeness of the living creatures, their appearance was like burning coals of fire, and like the appearance of lamps: it went up and down among the living creatures; and the fire was bright, and out of the fire went forth lightning.
14 And the living creatures ran and returned as the appearance of a flash of lightning. KJV
Angels remaininvisible to us until the Lord permits them to reveal themselves.
Remember in Genesis 19, when the angels came into the city of Sodom, the people thought they were just ordinary men for they looked just like regular men.
Angels can be frightening to see and that is why in the bible they would say to the people before whom they appeared, “Do not be afraid.”
Dan 10:7-12 And I, Daniel, alone saw the vision [of this heavenly being], for the men who were with me did not see the vision, but a great trembling fell upon them so that they fled to hide themselves.8 So I was left alone and saw this great vision, and no strength was left in me, for my fresh appearance was turned to pallor; I grew weak and faint [with fright].11 And [the angel] said to me, O Daniel, you greatly beloved man, understand the words that I speak to you and stand upright, for to you I am now sent. And while he was saying this word to me, I stood up trembling.12 Then he said to me, Fear not, Daniel… AMP
All the people who saw angels in the bible were afraid, in disbelief and couldn’t believe what they were seeing.
Angels carry a lot of the glory of God because they have been in the presence of God for thousands of years.