Zeiram

Zeiram is one of the first unstoppable killing machines in history. Their genetic origin is unknown. All that people know that he's an unkillable space creature that can't be stopped by conventional means, although its core seems to be its weak point. This alien has adept fighting skills and incredible strength and adaptive intelligence. While only one is known, one can assume that, if it is a species and not some sort of creation, that there would be several to exist, even if only one Zeiram currently remains.

Appearance
The Zeiram's primary form is that of a cloak-wearing imposing humanoid with a single red eyed slit and on top is a flesh protrusion that looks like a wide brim hat and at its center is a small noh-style mask face that would often hiss or growl when he is threatened or about to attack. This mask face is attached to a tentacle-like appendage that can stretch to unknown lengths and also serves as a primary way of feeding. Eventually the one known Zeiram shown to exist loses its hat-like protrusion in favor of a more humanoid appearance with a few alterations that makes his appearance similar to a kitsune and the little white face is moved to the chest and now bears a feminine look.

Abilities
Zeiram's main ability is to assimilate organic and inorganic materials into his body to put to use for him, he absorbs organic materials to survive to rejuvenate himself and if it is desperate it can engulf an entire organism and draw from its genetic materials; it has also been known to assimilate weapons and utilize them, as well. His physical strength is above human standards as well as adept in hand to hand combat. He is strong enough to send a human flying into a wall with one single kick and his physical endurance is no slouch either, Zeiram can easily withstand a barrage of bullets, multiple stabs from a blade, being hit by a speeding vehicle, set on fire, decapitation, as well as surviving a crashlanding onto a planet with only a few gashes to his flesh and still keeping on rampaging no matter the injury.

There were two occasions that he was reduced to the hat form and he was still active. In this "Hat Only" form he is able to fly like an organic saucer.

One occasion involved him reduced to a skeleton and he was still alive, even though he shows no evidence that he speaks. However he can understand the human language and another form of evidence that he's incredibly intelligent is his ability to hack into computer mainframes and control any function to his will. He has the ability to create inferior clones of himself to serve as scouts and fighters and able to create advanced clones, he also can protrude tentacles to ensnare his soon-to-be-assimilated victims and generate simple staff weapons from his body as well as shuriken and sharp claws, and has the ability to elongate his arms in order to get to high places or disarm a foe.

Weaknesses
When it comes to weaknesses Zeiram has virtually none physically or chemically. However his true weak point is the flesh core which happens to be the white face. If the core was destroyed completely Zeirams functions would cease, but if its merely cut off from its body intact it would be inert. At one point, the core was presumed dead until a shadowy organization retrieved the intact core and rebuilt him, moving the core to the belly of the cybernetic body but it does not stop him from controlling the cyborg body. Getting close to the core to destroy it is not easy since Zeiram keeps on moving and making sure nothing happens to his core.