The sibling conflict teased on the cover of#19 may be the hook that pulls readers in, but it will be another reveal in the issue that will occupy a spot in comics history, as one of the book's characters will reveal she is transgender, the first time a character has done so in a mainstream superhero comic.

Wired reports that writer Gail Simone was inspired to create a transgender character by a conversation with Batwoman co-creator Greg Rucka at Wondercon a few years ago. Simone asked why there seem to be fewer gay male comics characters than lesbian heroes (such as Batwoman). Rucka replied it would be a huge sign of progress for a gay male character to appear on a comic cover. It'd be even bigger if the character was transgender.

Find out just who will be revealing her transgender status in the book, as well as have a look at the full cover to Batgirl #19, after the jump.