"So the boggart sitting in the darkness within has not yet assumed a form. He does not yet know what will frighten the person on the other side of the door. Nobody knows what a boggart looks like when he is alone, but when I let him out, he will immediately become whatever each of us most fears."
—Professor Lupin to his Third سال class in 1993[src]



A boggart is a shape-shifter that takes on the form of its intended victim's worst fear. It likes to hide in dark, enclosed places, such as closets and cabinents. Since a boggart changes shape upon sight, few know what one looks like in unaltered...