Kaiju (Pacific Rim)

The Kaijus are a kind of giant monsters that are the main antagonists of the Pacific Rim franchise. They are alien creatures created by a race called the Precursors, who seek to make Planet Earth a place for them to inhabit and colonize.

Description
They are amphibian creatures of a highly toxic nature and are classified into 5 categories on the Serizawa Scale. Categories 1 and 2 represent the weakest Kaijus, while categories 3 to 5 represent the strongest. They are colossal in size and due to their tremendous body mass, it takes two pilots in a Jaeger to stand up to them. Each Kaiju has special abilities with which they are powerful, such as producing electromagnetic charges, immense strength, powerful jaws for biting and tearing, sharp claws, etc.

When they decompose, they release a liquid called Kaiju Blue, which is highly corrosive and pollutes the air and the immediate environment. That is why scientists have not been able to study the internal biology of the Kaijus very well as their blood is impossible to extract without it corroding whatever it touches. Their bodies allow them to adapt and dominate on land and water once they enter Earth through the breach. Kaiju are able to breathe and survive in multiple types of environments, which include land, underground in extreme heat and high pressure, underwater and even in places without air, such as space.

Kaiju are highly aggressive creatures, especially when engaged in combat. However, they are not clumsy nor do they possess limited intelligence. Working through a hive mind system, the Kaiju can communicate instantly, like animals in real life do.