To comment on Wesman Todd Shaw's statement, Lucifer being second only to GOD is not proven in the Bible anywhere. There is only one Archangel named in the Bible and that is Michael. Just one of God's angels will bind Satan and cast him into the bottomless pit for a thousand years (Rev 20:1-2). Nephilim were the offspring of fallen angels and human women, not the fallen angels themselves. But, again, people who simply believe what they're taught, rather than proving it by the Bible, should do the latter.
ChristianSoldier, it is God who caused the kings of Babylon and Tyre to come against each other (Ez 26:7). The king of Tyre was a beautiful cherub, but all of God's angels are beautiful, just in different ways.
The Bible doesn't say Satan was ever an angel, but calls him "the Dragon, the Serpent of Old, the Devil and Satan" (Rev 12:9; 20:2), and states that "he was a murderer from the beginning" (John 8:44). The word for 'serpent' in Gen 3:1 is 'nachash' and means a literal 'snake, from its hiss'. Satan can speak through and use whatever/whomever he wants (even Peter in Mat 16:23 and of course, Judas in John 13:27). If Satan were an angel, he would align most with the seraph (fiery serpent). "Lucifer" (helel - star of the morning) in Isa 14 matches the description of the cherub in Ez 28 (ref Isa 14:11 and Ez 28:13). Biblically, Satan aligns with the allegory of the multi-headed Dragon that lives in the sea: Leviathan (Ps 74:14; Is 27:1) and the Dragon/beast of Revelation (13:1-3).