satan
5th is right, satan started out in the OT as an angel, not a fallen one mind you. he didnt comit any sins, he didnt do anything wrong, he just sat around praising god, and when he saw a weakness in man, of whom he was jealous beause man is superior to the angels in the fact htat we have free will, he would point it out to god and make him try to remidy it through a test.