motivation based on lack
Original Dramatica Definition
When a character lacks something in the sense of having Deficiency, he may not even comprehend what he lacks. But this lack drives him and fulfilling the lack would end the drive caused by the Deficiency. Deficiency is closely related to Need, but where Needs are always defined by their context and the purpose which makes them seem necessary, Deficiency does not require a purpose. When a character lacks, he is NOT content with what he has and REQUIRES something more in order to become content. Fulfilling a lack may appear to be the last thing a character Needs because it does not lead to his purpose, but once the lack has been taken care of, a character may find his purpose has changed and his Need has been eliminated.
syn. inadequacy, insufficiency, deficit, unfulfilled need