Indeed, some good questions.
Here is my understanding, based upon the Scriptures.
The passage in Isaiah 14:4-18 is just what it says: it is a proverb, or taunt, against the king of Babylon. Much metaphorical language is used.
Vs. 11, "All your pomp has been brought down to the grave..."
He is seen to die and go to the grave (sheol-Heb.)
Vs. 12-15, "How you have fallen from heaven, O morning star, son of the dawn!" NOTE: The Hebrew word here translated "morning star" is translated "howl" in a number of other verses.
So this whole passage is a taunt against the king of Babylon, who said in his heart "..I will be like the most high"...etc. NIV.
Yet in vs. 15 we read, "But you are brought down to the grave, to the depths of the pit." This prophecied that the king of B. would die like a man; something that will not happen to Satan, a spirit being.
Then in Ezek. 28:1-10 we read that it is a prophecy against the prince (ruler) of Tyre. He obviously says in his heart he is a god, and sits in the seat of God. But he is told "..you are a man and not a god.." Vs. 10 reads, "You will die the death of the uncircumcised at the hands of foreigners." NIV.
So, regardless of the metaphors used, he is a man and will die.
And, Ezek. 28:11-19 is a lament concerning the king of Tyre:
The Lord says, "You were the model of perfection, full of wisdom and perfect in beauty. You were in Eden, the garden of God:
NOTE: the phrase, "Eden, the garden of God" is referred to in other passages and can mean the "trees of Lebanon, like Eden." Do a word strdy.
And all the descriptions of 'covered with jewells' etc, can be figures of speech. Tyre was very wealthy because of its sea port and trading with the known world. Yet, it became filled with wickedness and sin (vs.15-16). Not only is this lament against the king, but also the whole kingdom of Tyre. "By your many sins and dishonest trade you have desecrated your sanctuaries..(vs18)".
The outcome? "..you have come to a horrible end and will be no more (vs.19)."
History says, Tyre was conquered by Alexander the Great, who decimated the city.
The above is about humans, not about Satan.
From beginning, his name is 'Satan' which means 'adversary.' It is difficult to understand, but I see in God's great plan, that He knew Adam and Eve would disobey, and receive the penalty of death, though it took Adam 930 years before he died. And seemingly, God created Satan as the perfect adversary. Does Satan have 'free will' to choose where he is? I don't think so. God is sovereign and He created him as he wants him.
As to his names and titles, Revelation 20:2 gives them all: "...And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years..." 'Devil' means 'accuser.'
Other interesting points: while Satan is a spirit being, he is never called an angel (messenger), though
2 Cor. 11:14 tells us "Satan himself masquerades as an angel (messenger) of light." He is deceiving unbelievers with the supposed 'truth'.
From the beginning Satan was a murderer and had no truth in him:
John 8:44 "You are of [your] father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speketh a lie, he speaketh of his own: for he is a liar, and the father of it." KJV.
1 John 3:8 "He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil."
We know that Satan has not been 'cast down to the earth', for in Job we read of Satan being in heaven and talking with God. Also, the book of Revelation is yet future, and it is in the middle of the seven years tribulation, that Satan and one third of the angels in heaven (Satan's messengers) who are driven down to the earth (Rev. 12:9).
MY CONCLUSION: Satan was created according to God's purpose, to be the accuser, the adversary.
