Many new openly gay, lesbian and bisexual characters have since emerged in superhero fiction, such as Gen¹³'s Rainmaker, Apollo and Midnighter of The Authority, and Wiccan and Hulkling of the Young Avengers. Notable transgender or gender bending characters are fewer in number by comparison: the alter ego of superheroine Zsazsa Zaturnnah, a seminal character in Philippine popular culture, is an effeminate gay man who transforms into a female superhuman after ingesting a magical stone. Desire from Neil Gaiman's The Sandman series and Xavin from the Runaways are both characters who could (and often) change their gender at will. Alysia Yeoh, a supporting character created by writer Gail Simone for the Batgirl ongoing series published by DC Comics, received substantial media attention in 2011 for being the first major transgender character written in a contemporary context in a mainstream American comic book.
The practice may have originated in a Celtic festival, held on 31 October–1 November, to mark the beginning of winter. It was called Samhain in Ireland, Scotland and the Isle of Man, and Calan Gaeaf in Wales, Cornwall and Brittany. The festival is believed to have pre-Christian roots. After the Christianization of Ireland in the 5th century, some of these customs may have been retained in the Christian observance of All Hallows' Eve in that region—which continued to be called Samhain/Calan Gaeaf—blending the traditions of their ancestors with Christian ones. It was seen as a liminal time, when the spirits or fairies (the Aos Sí), and the souls of the dead, could more easily come into our world. It was believed that the Aos Sí needed to be propitiated to ensure that the people and their livestock survived the winter.