Paradise Lost by John Milton is a story where we get an alternative perspective of Satan. If we look at older European art, Satan is very consistently depicted as a grotesque monster, or represented by something like a dragon. In the 1600s, John Milton wrote a book trying to view an alternative side to Lucifer. Not so much a one dimensional cartoony character with a pitch fork and bat wings but God's beloved who had thoughts and feelings of his own who was cast out of heaven and abandoned by the one closest to him. The story asks the question of whether or not divine evil can have character development and if the antagonist of one story can be the protagonist in another.
I don't recommend necessarily reading it directly due to how out of date a lot of the language is. It's very 17th century with the author also just making up words entirely in some cases by taking some loose interpretations of Latin and Biblical references. Fun trivia, the word pandemonium comes from this. "Pan-" being a prefix meaning all, "-ium" being a suffix meaning where something takes place/what something is made up of. We usually use the word to mean chaotic, but pandemonium literally means "place of all the demons" and it comes straight from the text. Below is a very cute video that does a great job describing the story in detail.