Answer:
What is often returned but is never borrowed?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
A morbidlyยญ-named body of water
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around
I can be short and sometimes hot. When displayed, I rarely impress.
I'm the source of all emotion but I'm caged in a white prison.