User blog comment:Baneares/Coldhearted countdown/@comment-432124-20120309034312/@comment-1038387-20120309131812

If the key word is "independent", most of those don't really apply.
 * Vixen: Created for the Justice League, has had limited alone time.
 * Fire and Ice: Global Guardians, then Justice League, Super Buddies and I Can't Believe it's Not the Justice League (don't ask). Fire was also part of Checkmate. No alone time.
 * Black Canary: The original Golden Age Black Canary debuted as a supporting character in a Johnny Thunder story. She joined the Justice Society soon after. Silver Age Black Canary never appeared without the Justice League. The modern version may have had three miniseries, she's been predominantly in teams or families: Green Arrow, Justice League, Birds of Prey.
 * Katana: created for the Outsiders, never appeared without them.
 * Starfire, Raven: created for the New Teen Titans. Not solo heroines.
 * Black Alice: Not really a hero. (But not a villain either). However, not a solo character.
 * Solstice: created for, and has only appeared as a member of, the Teen Titans.
 * Bumblebee: Titans, now Doom Patrol. Not an unaffiliated solo heroine.