Answer:
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
What type of bar gets you wet walking in and out of it but keeps you dry inside?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Salty water everywhere but not sea in sight.
People take me on walks and I run and have fun. What am I?