Themis

Themis was the Ancient Greek Goddess of Divine Justice. She also did a stint at the Delphic Oracle.

The star sign Libra (which happens to be my own) is another incarnation of Themis.

I've depicted her AS the scales rather than holding them, because if she was holding them in one hand, the other hand could only be holding a sword, as is depicted on some representations. But as I understand the myths about Themis, her Justice was benevolent rather than coercive.