Vaxasaurian

The Vaxasaurians are an extraterrestrial species of humanoid dinosaur-like aliens from the planet Terradino.

Appearance
In their normal size Vaxasaurians resemble humanoid dinosaurs with four-fingered hands that have ape-like nails on the end of each. Their feet are elephant-like and have three toes. They naturally have either green eyes with no pupils or red eyes with cat-like pupils, along with brow-like extensions. Their teeth are white and almost human-like with the exception of a few fangs.

Male Vaxasaurians have tan, brown, beige, dark green and gray skin with their underbellies, the front side of their necks, and the sides of the arms that face the body being lighter-colored.

Females have medium red skin and slightly darker underbellies. Their chins are slimmer and they have stripes around their body that are the same color as the skin but darker. They also appear to have feminine breasts similar in appearance to those found on female humans, hinting the species to be more mammalian than reptilian.

Powers
Vaxasaurians are able to grow in size at will; as they grow, their dinosaurian features start to become pronounced, including stegosaurid back plates and thagomizers on the tail. Also, on the shoulders, three plates separate and grow along with the plates on the forearms. On the top chest plate, a small triangular extension forms on the bottom while the bottom sides stretch down and curve towards the center, ending at a point. The legs also seem to become slightly longer.

Vaxasaurians are strong enough to throw objects into near-orbit. According to Eugene Son, they can also lift a To'kustar with ease, even in their base height.

Vaxasaurians can temporarily survive in the vacuum of space without any special equipment.

A Vaxasaurian's thick hide makes them durable against most attacks.

Vaxasaurians are quite agile for their size.

In the reboot continuity, Vaxasaurians have naturally occurring weapons on the ends of their tails that resemble a plethora of medieval weaponry. These include maces, swords, war hammers, and battle axes.

Weaknesses
Vaxasaurians are very slow and unable to fit in tight places.

Vaxasaurians are built for land, meaning they are unable to breath underwater.

Vaxasaurians are vulnerable to electricity, such as the attacks of an Amperi.

Vaxasaurians can be trapped by an Evolved Arachnichimp's webbing.

A Vaxasaurian's tail weapon can accidentally cause collateral damage, and can even injure themselves.

Predator
The Vaxasaurians' natural predator is a Tyrannopede. These apex predators can easily defeat and devour a Vaxasaurian with their powerful jaws and can snare their prey with a heavy-coated web fired from their horns.

Omnitrix Transformation
The Omnitrix's Vaxasaurian representative is named Humungousaur, who first appeared in the Alien Force episode "Ben 10 Returns: Part 2". Humungousaur has appeared in every subsequent series.

The Ben Tennyson of Dimension 23 has an equivalent of Humungousaur named Dino-Mighty, who first appeared in the Omniverse episode "It's a Mad, Mad, Mad Ben World: Part 2".

Humungousaur has also been used by the Prime Timeline Gwen and Azmuth, Albedo, Vilgax's Bioid army, the Ben 10 Franklin version of Benjamin Franklin, a Plant Clone, and the Alpha Nanite.