@drarcania: If Joker was immune to chemicals and all known diseases in all the known universes, then he wouldn't have been dying from the titan overdose in Arkham City. He himself even admits he was dying and if he was lying, then why pump Batman full of his blood to infect him in order to get him to help the Joker? Batman himself was dying from that, which means the Joker was also dying. The Joker being immune to all known chemicals makes no sense in light of this fact. The game clearly paints a different picture. If Joker was immune to the titan overdose, he wouldn't have searched so hard for the cure. Oh and if the Joker is immune to all known chemicals as you claim, then Joker wouldn't have transformed into a hulking beast after injecting himself with titan as he would have been immune. The scene you speak of is nothing more than a mistake on Rocksteady's part and is not conclusive evidence the Joker is still alive.

If the Joker was still alive, he would have made his presence known in Arkham Knight because the Joker loves the spotlight, he's not one to hide in the shadows and let everyone think he's dead. Even Harley thought he was dead because, guess what? The Joker is dead in the Arkham verse. The fact that some fans think he might still be alive is only wishful thinking. ALL, and I do mean ALL, the evidence points to the Joker being dead. It doesn't matter to me if Rocksteady lied about the Arkham Knight's identity being original or the the Black Mask in Origins was the main villain when he wasn't. That's not proof they lied about the Joker being dead. There is absolutely zero hint that the Joker was somehow still alive in Arkham Knight or the comics. You think Harley would still want revenge on Batman and still think Bruce killed the Joker? No, she wouldn't because there's no way the Joker wouldn't have told her he was still alive. Harley would have known but she acts like he's dead and that is because the Joker is dead in the Arkham verse. The fact that the Joker was on the Possible Dead list for two years only means that some fans cannot come to believe what the games have clearly established. It's pretty obvious that the Joker is dead. There really is no way around this fact. I also find the reasons given of his death on this list as a little confusing. Dead for from unknown reasons?Anyone watching the end of Arkham City knows the Joker died from the titan overdose.

One last thing I'd like to point out to hammer my point home is this: Use the google search engine about the Joker's death in Arkham City and the vast majority of the fans out there believe he's truly dead and that's because he is. As I said earlier, there really is no getting around this fact. Rocksteady may have lied about who the Arkham Knight was and about Black Mask in origins, but they didn't lie about this.