Who is the perfect mate for Libra?

Libras are pretty good with most signs. They always see both sides of things and are willing to compromise.

Signs a Libra should avoid would be those that would exploit the Libras tendency to give up what they want in order to make a truce with another.

Libra and Cancer would be a pretty good match. Libra could easily get through the Cancer's shell and they would enjoy the awesome depth found there.