This is a fascinating explanation from Ezekiel describing Lucifer as
he was created. Like a man but with four wings and a head with four
faces.
However, after his fall, how is Lucifer called a serpent?  Or perhaps
Lucifer indwelt a serpent to tempt Eve? It's not well explained. What
do you think?
https://followingmessiah.org/2018/12/08/what-is-satan-a-seraph-a-cherub-or-an-angel/

Lewis B