The words used for “angels” in both the Hebrew Old Testament and the Greek New Testament are words that mean a messenger. Often times these words are used to describe mere human messengers, but when it speaks the messengers of God it means these special creatures of a higher order than mankind.

So it is implied from the first that these angels were always meant to be subordinate creatures. They are merely carrying out will, the messages, of Yahweh God.

Are there others in the universe? Yes!

Truly, we are not alone. These powerful creatures carry out the will of their Lord God to care for men and to protect, OR warn men, OR when men have finally gone way too far despite many warning: to bring trouble or sickness, or even destruction. and death.

“The angel of Yahweh encamps round about those who fear him,
And delivers them.”
Psa 34:7 WEB

And,

“For he will give his angels charge over you,
To guard you in all your ways. ”
Psa 91:11 WEB

Or alternately,

“Let their way be dark and slippery,
Yahweh’s angel pursuing them.”
Psa 35:6 WEB

They are created beings, evidently, some
of the first created beings.

When the physical universe was being made, the foundations of the earth being set, and its cornerstones (Job 38:4-6), the angels were there, and some were called “sons of God” (Job 1 and 2) and “morning stars.”

“When the morning stars sang together,
And all the sons of God shouted for joy?”
Job 38:7 WEB

Angels are given assignments
of men or nations

One angel is describes as “the prince of the kingdom of Persia,” in Dan 10:13, and it would appear is supposed to be looking after the kingdom of Persia. Another, one named Michael, is the prince of the people of God, Dan 12:1, and is described as an “archangel” in Jude 9. It says of an angel in Revelation 16 that,

“8 The fourth poured out his bowl on the sun, and it was given to him to scorch men with fire. 9 People were scorched with great heat, and people blasphemed the name of God who has the power over these plagues. They didn’t repent and give him glory.”
Rev 16:8-9 WEB

That is powerful indeed, far beyond man’s feeble powers in this world.

And there are armies of angels

The Hebrew word tsaba is a word for war, warfare, or armies, and sometimes translated that way, or is translated as “hosts”/armies

And Yahweh, is the Lord of armies, both earthly and heavenly. The angels who surround Him say,

“One called to another, and said,
“Holy, holy, holy, is Yahweh of Hosts!
The whole earth is full of his glory!””
Isa 6:3 WEB

In Revelation 12 the archangel Michael is leading a war in heaven.

Angels are moral creatures, but are NOT perfect

“Behold, he puts no trust in his servants.
He charges his angels with error.”
Job 4:18 WEB

In fact, some angels have turned bad, have tried to overthrow God.

WEB is the World English Bible, a copyright free revision
of the original ASV American Standard Version 1901