Satan/Lucifer/Devil I believe is a Seraphim - type of Angel Which one of the definitions in Hebrew is a fiery serpent/ flying dragon. Now imagine being excluded from God and how evil and demented one would become. Makes sense how demon possessed people have serpent eyes….and why their followers worship the snake and how Christians are given power to trample serpents and scorpions.
https://www.blueletterbible.org/lang/Lexicon/Lexicon.cfm?strongs=H8314&t=KJV