Your guardian angel's full and complete existence is to present you to the "Marriage supper of the Lamb" Revelation 19:7

Angels are mentioned in the Bible 230 times including 130 in the new testament, described by multiple church fathers, confirmed in church councils, added to the Nicean Creed and part of the major Vatican councils.

The nature of the angels are pure spirit and therefore do not have bodies. They have a beginning but no end and are classified as persons. There are 3 classification of persons. Divine Persons which is God the father, God the son and God the Holy Spirit. There are human persons which are male and female. We have angelic persons with nine types of angels.

and each of them have a extremely intelligence and free will.

They are the first created of all beings so a very privileged place in the order of creation

They give us a reflection about the nature of God and his majesty.

and their intelligence so high that all information needed is immediately known. They understand everything as it is in the full extent and the angels choice of saying yes or no to God is immediate with total understanding and therefore can be re-arranged or changed.

When God asked each angel to guard each of our lives, the angels answer of yes was, is and will be permanatn. That angel is your best friend. Nobody will stick closer to you with all the guardian angels to constantly bring you to conversion, safety and salvation.