Leopard doesn't change its spots

Leopards don't change their spots,
Zebras don't change their stripes.
Nature made them that way,
so it's best to leave them that way.

(Can you imagine a striped leopard or a spotted leopard?)

The ogre in wayang is always the BIG guy with lots of (redundant) actions and noise,
while the noble 'good guys' seldom even lift a finger or say much.