Satan
The Book of Enoch,  is not part of the Bible, but seems to have been popular among many early Christians and Jews during the life-time of Jesus. The fallen angels according to this book did not try to become equal to God, but wanted to live among humans. They revealed the secrets of heaven, which leads people to war and sin. Satan, however, is not one of the fallen angels in this Book, but punishes the fallen angels (and wicked humans) for their sins.