Vagnosaurus is yellow all over, and has black claws. She has strong forelegs and no hind legs, meaning her tail is always on the ground. Her tail seems to be similar to that of lobsters, and she also has many limbs coming out of it, similar to Biollante's hands.
Vagnosaurus is presumed to be an ancient creature.
She was 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.