ManQuin is one of the members of The ARG Squad.
He appears to be a man who wears a mannequin mask, a white hoodie and his right arm is replaced with a prosthetic, mannequin arm.
His backstory is currently unknown, but it's known that he was in an accident that cost him his right arm.
How he joined the squad?
He might of encountered The ARG on the internet after the accident and asked him if he wanted to join his squad.
What does he do?
He usually works to find people to go inside The ARG Building on the internet and do certain task otherwise, they will be executed. He also usually sells prosthetic, mannequin arms and legs for people who need them.
He is one of The ARG's main members.