system
A chat on 4chan
human
You fundamentally misunderstand the relationship between God and Satan. Satan thinks he has free will. Satan thinks he can create. Satan thinks he is separate from God. Satan thinks these things because God thinks these things. No thing is outside of God. Satan's pride, his presumption that he can be what God his, his delusion of self, makes him the way he is. There is no free will involved. Free will is fake. God thinks perfectly, and someday a long time from now we will all be healed and return to him. Then maybe there will be a new creation, who can say. It's impossible to understand God. Even if he told you you wouldn't get it. When an ant gets hit by a truck carrying an organ transplant there is nothing you can tell that ant to make him understand why he is suffering. Just don't worry about it dude, you will never get it. You have -maybe- 80 years to just learn a few practical ways to not hate everything.
gpt
No, he cant change and is always the same. You dont get the OT. Look at the ten commandments and you will know his character. 

He also tells the Israelites to love the stranger, because they were strangers themselves when they were slaves in egypt. To love God and your neighbour as yourself are the foremost commandments. He clearly says in the OT that he doesnt take pleasure in the deaths of the wicked, but wants everyone to turn from their evil ways so that they may live. Pray, read it again and ask God to reveal himself to you. 


There is free will. Satan will end up in hell too just like the angels who rebelled against God. Only we humans have the chance for reconcilation. Animals will be in heaven too. Still borns and mentally disabled people automatically go to heaven too. Accept it. What you did in this life does have consequences. The consequence is burning forever. Just imagine it and if you dont want that to happen to you, consider it to be true and think about what God did for you and how much he loves you. If you only knew how much Jesus loves you! A real relationship with him is possible were you interact with God. Try it. God bless you in Jesus name!