The Devil (Theology)

Lucifer, also known as Satan or simply The Devil is a main antagonist in many religious theology books from the Bible.

He is we once a servant working with God under his order and eventually due to his nature led himself down into villainy.

What made him heroic?

 * Before his eventual nature, we know that he at least in the Theology worked with God and helped him along the way.

What makes him villainous?

 * He eventually due to his nature led himself to being the embodiment of evil. He became the Devil and rejects his potential opportunity to do good.
 * He creates a evil world that is meant to be the embodiment of torturing and suffering upon those who join.
 * He corrupts many other Angels having them fall down with him and has many plans to gather more people capable of being just as corrupt to lure in to Hell.
 * Lacks a lot of redeeming qualities overall.

Trivia

 * The Devil is a best iconic example of a fallen hero as he as a "Fallen Angel" was once good and turned to villainy like many Fallen Heroes.
 * He was once seen as Pure Evil. However, he got rejected due to lacking a moral agency and failing some standards. As his nature is meant to do just evil and the good he was able to do was mostly upon God's orders and not on his. As well as the standards he would fail.