A sketchy reference for my kaiju OC, Nikuchi. Her name means "two mouths", she can devour and digest anything, though things like buildings don't give her much in the way of sustenance. She has corrosive venom in her fangs and tail maw that let her melt down things that are too big for her to consume outright.
Her design is inspired by the Kaiju of Pacific Rim, and she shares some of their abilities, such as adaptability to land, sea, and space. Oxygen isn't a factor.