turn out to be

turn out to be (someone or something)

To be eventually discovered or considered to be a certain type of person or thing in the end or over time. The tomb turned out to be the resting place of an Egyptian Pharaoh. He was so charming on our first date, but he turned out to be a real jerk. This project is turning out to be a huge pain in the butt for everyone on the team!
See also: out, to, turn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

turn out to be someone or something

to develop or become someone or something in the end. In the end, he turned out to be a handsome prince in disguise. The previous prince turned out to be a frog.
See also: out, to, turn
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in classic literature ?
But I shall be surprised if it does not turn out to be correct.
WHILE I can fully understand why police officers are saying "we really should be routinely armed" (Birmingham Mail, October 4), I believe that it would turn out to be a retrograde step.
In the end, the queer perspective of gay bloggers may turn out to be the most effective route yet to visibility.