one of the faithful
Someone who is a devoted fan or supporter of someone or something. A reference to those who have faith in a particular religion. I was one of the faithful there to buy the company's latest product on day one If you are not already one of the faithful, the author's latest book doesn't do anything that will likely enamor your to the series, but longtime fans will find plenty to reward them.
one of the faithful
n. a drunkard. Here comes Mr. Franklin—one of the faithful—staggering down the street. I saw one of the faithful standing at the bar.