vampire
US /ˈvæm.paɪr/
UK /ˈvæm.paɪr/

1.
2.
a person who preys on others, especially by extorting money or by taking advantage of their weakness
:
•
He's a real emotional vampire, always draining the energy from everyone around him.
•
The company was accused of being a financial vampire, exploiting its employees.