Emerald Empress (DC)

The Emerald Empress is the name of several, fictional super-villains appearing American comic books published by DC Comics, primarily as enemies of the Legion of Super-Heroes. She is also an enemy of Superman and Supergirl.
Sarya of Vengar was created by Jim Shooter and Curt Swan, debuting in Adventure Comics #352 (January 1967).
Cera Kesh was created by Tom Bierbaum, Mary Bierbaum, and Chris Sprouse, debuting in Legionnaires #2 (May 1993).
Falyce was created by Paul Levitz and Keith Giffen, debuting in Legion of Super-Heroes Annual Vol 6 #1 (February, 2011).