Polymorph (Ben 10)

Polymorph is a species of single-celled organisms that is neither liquid nor solid but a colloidal suspension from the molten planet of Viscosia.

Anatomy
Polymorphs are 200-pound gelatinous extraterrestrial blobs of slime that come in many colors including light green, red, blue, orange, mint green, purple, and grey.

The slime is normally in a humanoid shape with a pointed head, narrow eyes, and "spikes" on their shoulders. They can, however, turn into a shapeless mass such as a puddle or mimic the shape of something. Their brains are spread throughout their entire bodies.

Powers/Abilities
Polymorphs can generate and shoot acidic or adhesive slime from their bodies as either streams similar to a water (when coming out of a hose), blob-like projectiles, or even spit despite not having visible mouths.

Polymorphs are almost invulnerable because even when their slime has been scattered all over the area, they can still recollect as long as their Anti-Gravity Projectors, the small flying saucer-shaped devices that hover over their heads, are still active.

Weaknesses
Outside of Viscosia's gravity, Polymorphs can only have its body function when it is united with its anti-gravity projector. This means that if the two are separated, the slime will go inert until recollected.

Language
A Polymorph's voice is projected by their Anti-Gravity Projectors.

Technology
Whenever they are a planet other than Viscosia, Polymorphs use Anti-Gravity Projectors to be mobile in a foreign planet's gravity.

Omnitrix Transformation
The Omnitrix's Polymorph representative is named Goop, who first appeared in the Alien Force episode "The Gauntlet". Goop has appeared in almost every subsequent series except the reboot.

The Ben Tennyson of Dimension 23 has an equivalent of Goop named Muck-A-Muck, who was confirmed to exist in the Omniverse episode "It's a Mad, Mad, Mad Ben World: Part 1".

Goop has also been used by the Prime Timeline Vilgax and Albedo. According to Derrick J. Wyatt, Bad Ben, Mad Ben, Nega Ben, and Benzarro all have Goop available in their Omnitrixes.

Etymology
Polymorph is a word meaning "many shapes".