Plasmavore
Plasmavores were humanoids that sucked blood. They were usually criminals, murdering people across the galaxy and drinking their blood.
Biology
Plasmavores were human-like in appearance. When they drank the blood of their victims, they could mimic the internal structure and genetic material of their victim. They needed blood to survie as their bodies absorbed a lot of salt.
Appearances
Smith and Jones (TV)