Vagnosaurus is completely yellow, and has black claws. She has strong forelegs and lacks hind legs, while her tail is used in their place. Her tail seems to be similar to that of a lobster's, and various limbs emerge from it, similar to Biollante's tendrils.
Vagnosaurus is presumed to be an ancient creature.
Vagnosaurus is capable of constricting and lashing out at her victims using her tentacles. Vagnosaurus can drain the energy from enemy kaiju through her tentacles. Vagnosaurus also had the ability to create some sort of poison beam. Vagnosaurus also uses her massive bulk to battle foes, body slamming them.