Also there was Joker’s unnamed boyfriend in the graphic novel Devil’s Advocate. The Joker repeatedly confessed his feelings to Batman and showed an interest in other men. That is why it’s so important to me and other queer readers to return his homosexuality. This opinion was shared by other comic books authors and artists for decades.
Neal Adams claimed that The Joker was and always had been homosexual. The Joker is a comic book character with almost 80 years history, half of which he was portrayed as homosexual - for instance, in such significant graphic novels as Frank Miller’s The Dark Knight Returns or Grant Morrison’s Arkham Asylum: A Serious House on Serious Earth.