After the success of The Animated Series, the character proved so popular that she was eventually added to the Batman comic book canon. She first appeared in the original graphic novel, Batman: Harley Quinn, as part of the "No Man's Land" story, although she had already appeared in the Elseworlds Batman: Thrillkiller and Batman: Thrillkiller '62 in 1997. The comic book version of Quinn, like the comic book version of the Joker, is more dangerously violent and less humorously quirky than the animated series version. Despite her noticeably more violent demeanor, Harley does show mercy and compassion from time to time; she notably stops Poison Ivy from killing Batman, instead convincing her to leave the hero hanging bound and gagged from a large statue. Batman is later untied by Batgirl. While the comic book version of the character is still romantically linked with the Joker, a more recent development has Harley also romantically involved with Poison Ivy. Harley Quinn series writers Jimmy Palmiotti and Amanda Conner confirmed that the two characters are in a non-monogamous romantic relationship.