About the content above, the Word of GOD explains very well who is the red dragon. What matters and prevails is the Word of GOD, the Word is GOD, GOD Himself, self-executing, understand?
Apocalypse (Revelation) 12:9 reveals : -And the great dragon was (will be)cast out,
that old serpent,
called the Devil,
and Satan,
which deceiveth the whole world:(as we can see, including by Internet)
he was (will be) cast out (from heaven-Ephesians 1:3-8) into the earth,
and his messengers (2Corinthians 11:13-15) were (will be) cast out with him.
I disagree . First, in John 8:44 my Lord JESUS describes Him specifically as a liar, saying to the Jews: Ye are of your father the Devil(the MAN of sin, a Jewish MAN, the son of perdition), and the lusts of your father ye will do. He was a murderer from the beginning (killed Abel-Matthew 23:33-35), and abode not in the Truth, because there is no Truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it. It's it.
OTOH, "the dragon being great and red" as you said, it is not only because his malign nature, but he is great as is written in Luke 4:5-7:
5 The Devil taking JESUS up into an high mountain,shewed unto JESUS all the kingdoms of the world, 6 saying unto JESUS: All this power will I give thee, and the glory of them: for that is delivered unto me; and to whomsoever I will I give it. 7 If thou therefore wilt worship me, all shall be thine. It's it.
Finally, regarding dragon be red , linking "red" as "the nature and character of the dragon being fierce and murderous. In fact it is his SPIRIT as is showed when Cain killed his bother-Genesis 4. We are talking of the Word of GOD, not of the storytellers. In fact, biblically speaking, it is the Hebrew word Edom means "red", and the Hebrew Bible relates it to the name of its founder, Esau, the elder son of the Hebrew patriarch Isaac, because he was born "red all over". As a young adult, he sold his birthright to his brother Jacob.
FURTHERMORE, in this current moment the dragon still has not 7 heads, it will be added to his satanic body only after he stealthy manifest himself as a lamb(a false lamb, a false messiah-John 5:43-47), an esoteric, and kabbalistic, and spiritist messiah, and he will speak as dragon, as is written in Revelation 13:11. In fact he is at door, he was born decades ago, and as soon as he declares himself as the messiah of the Jews-John 5:43-47, he will sit in the holy city of Jerusalem shewing himself that he is God.-2 Thessalonians 2.
Get ready
Here is the mind which hath wisdom. What does the Word of GOD say? The 7 heads are 7 mountains, on which the woman sitteth-Revelation 17:9. Now, now, it already has lasted 2000 years the woman sits on 7 mountains. Which are these mountains? Who is the woman? Do you know? Do you have the answers? Please, tell us.
The 7 heads is linked with 7 kings. Who are them? 5 are fallen, is, the seventh still will be manifest ahead.
What does the Word of GOD say? The 7 heads are 7 mountains, on which the woman sitteth-Revelation 17:9. Now, now, it already has lasted 2000 years the woman sits on 7 mountains. Which are these mountains? Who is the woman? Do you know? Do you have the answers? Please, tell us.
The 7 heads is linked with 7 kings. Who are them? 5 are fallen, is, the seventh still will be manifest ahead.
continue a short space.
I stop in this point for now.