Carol Ferris

Carol Ferris is an enemy turned ally of Green Lantern.

Carol is the Star Sapphire, an alias that has been used by several women over the years, but is most often associated with Carol, who is currently a heroic bearer of the title.

Carol is Hal's boss who was chosen to become Star Sapphire.

Justice League (TV series)
In the Justice League, she is one of the recurring enemies in both the original series and its sequel series. Here, she was Hal Jordan’s boss and had a psychotic breakdown, developing a secondary personality: Star Sapphire. This Star Sapphire shoots rays from her mask, not a ring. She is at first a member of the Injustice Gang, formed by Lex Luthor and later reformed again by Aresia. She later joins Gorilla Grodd's Secret Society. When Grodd and Luthor split into two factions, Carol joins Luthor's side, the side that wins. She then assists the Justice League in saving the world.

Justice League: Doom
In this film, Carol/Star Sapphire is joins the Legion of Doom, formed by Vandal Savage. When the Justice League storms the Hall of Doom, she faces off against him again. As they fight, Hal expresses anger over Carol's plan, saying that he couldn't believe what she did, only for her to coldly remark that he broke her heart, and she would never stop trying to kill him for it. She manages to capture him but he escapes and knock her out. Hal proceeds to take away Carol's Star Sapphire gem, reverting her back to normal, and admits that he keeps hurting her. This version is shown to be able to create both energy blasts and hard constructs. She was the only one to use the non-lethal version of Batman's contingency plans and was the last member to be defeated.