User blog comment:JadenLan/Salem - her name and her domain/@comment-25555436-20160214171952/@comment-25555436-20160214173358

Except they don't. The characters actually obey the laws of physics and (their) laws of reality.

It's the Grimm who don't. They don't eat, drink, shit, breathe, don't reproduce, have no blood, vanish on death, and need no nutrients of any sort to survive no matter how big and heavy they are.