For example, the Toad Demon, who is naturally with a large belly. Even after transforming into a human, their belly would still be much larger than a human's. This is due to their bodily characteristics and it affects shape shifting.
For instance, the Monkey Demon has a lot of body hair.
Take for instance, the Bull Demon and Elephant Demon, their sizes are huge that after transformation, they would still be immensely tall, there are jokes that they're eight feet tall.
These are innate defects, no, they are innate limitations.
As for Demons like the Leopard Demon, Cat Demon, Rabbit Demon and other types of female demons, who are either slim, symmetrical, or petite.
Upon becoming a Demon General and transforming into human shape, their physical characteristics will also manifest.
Like Cat Demons may have cat ears,
Leopard Demons have long legs,
Rabbit Demons naturally have eye shadows and such.
