Whoever asked this question, please, I highly recommend the
Bible to you.
A demoniac is someone whom the devil Satan sent a demon to so
they could possess them. Their face changes, as well as their
actions, words, and thoughts, dramatically. A disciple was a
follower of Jesus back 2000 years ago such as Peter, Andrew, James,
and John. There is a ginormous gap between demoniac and disciple,
and I'd vote for disciple if I were you.