Leecher

It's a dark, moonless night. You are standing around a power station when you hear a hissing, sparking noise from around the side of the station. Your skin crawls as you feel something is near. Something out of this world. You quietly creep around the side to see what is happening. There! In the cold light, a stark white humanoid creature, with glowing, electric blue runes on its body, is sucking the power out of a generator, with sparks flying like arrows. It hears your footsteps. It turns around and sees you. It stops leeching power from the generator. You are paralysed with fear as it ghosts towards you, ready to consume your energy and life force...

The Leecher is an energy being. It spends most of its time searching for sources of energy and power, which it can, and often will tap into, to leech the energy from it, hence its name. Although normally going after electricity sources, whether it be power lines, transformers or even entire power stations for a large energy boost, it can and will also tap into fire, lava, and even other creatures if those sources can be found. Occasionally, when it consumes too much plasma, it can slightly rupture and leak plasma like how a flesh and bone creature bleeds blood.

P.S. Take some time and have a good look at the skin before you say that this skin has flat colours. I mean, a really good look. The white is not flat.