The Devil
The devil is real. Let us not be deceived, he is a real being. He is seen on the pages of scripture from Genesis 3, when he tempted Eve, until Revelation 20, when he is sent to his eternal destiny; the lake of fire.
The devil has an innumerable number of angels operating under his domain. In every way these legions, along with their master, are anti-God, anti-Christ and anti-Christian.