One who participates in an involuntary theft or passive theft;

Thiefery is an action of theft without intent to deny the rightful owner of something of value or with the implied consent of the rightful owner;

An action of theft which provides benefit to the rightful owner;

Any action of theft with the implicit or explicit approval of the rightful owner.

When someone thinks they are the main character of their life. Usually comes with a side of individuality complex, quirky style and a self centered point of view.