Vaxasaurian

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.

Vaxasaurians can occasionally be seen in clothing. The attire can include caveman-like loincloths, stone-based accessories and/or bones and skulls of other species.

Predator
The Vaxasaurians' natural predator are Tyrannopedes, especially since they are unable to lift them up.

Powers
Vaxasaurians can grow their size at well, making their dinosaurian features pronounced. As such they gain stegosaurid plates on their backs and thagomizers on the tail. Three plates on their shoulders separate and grow along with the plates on the forearms. A small triangular extension on the top chest plate forms on the bottom while the bottom sides stretch down and curve towards the center, ending at a point. The legs seem to become slightly longer.

According to Dwayne McDuffie, Vaxasaurians can generate their Stegosauride features without having to change their size. They can also shrink down to about 10 feet.

Vaxasaurians are strong enough to throw objects into near-orbit. According to Eugene Son, they can lift a To'kustar with ease, even in their base height. According to McDuffie, they are physically stronger than Methanosians and Crystalsapiens. According to Duncan Rouleau, a Vaxasaurian's strength is at a level similar to that of Sasquatch.

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.

Certain 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. According to Rouleau, Vaxasaurians in the reboot continuity cannot alter their size.

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

Vaxasaurians are can be harmed by electricity, such as an Amperi's attacks. They can also be harmed by fire even when at full size, such as the attacks of either a Methanosian or a Pyronite.

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

Despite their enhanced strength, they are unable to lift anything bigger than a Tyrannopede. Technically speaking, they are physically weaker than Evolved Vaxasaurians. According to McDuffie and Rouleau, they are also physically weaker than Tetramands and Metahumans with the same powers as the Hulk.

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

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.