here you go, leeches are often called “bloodsuckers” or “parasites” because of their tendency to latch onto other creatures and feed off their blood. these terms often used to describe someone who’s seen as taking advantage of his resources Someone who takes more than they give, A person who depends on others for support, often without contributing. A similar reference, implying someone who drains others’ resources or energy or goodwill.
A bloodsucker is someone who constantly takes from others, whether it’s money, time, or effort, without offering anything in return.
These terms are definitely negative and imply that the person is leeching off others for their own benefit.