User blog comment:Smijes08/Arkham Knight: Joker- Ghost or Hallucination?/@comment-27663651-20160123202817

!SPOILER ALERT!

It's weird to me too. I think it is a trauma. Joker poisoned Batman with his own TITAN blood, remember? They'll both die in several hours. In the final battle, Batman did not kill him. Joker stabbed his shoulder with a knife and Batman dropped the cure but Joker thinks this is Batman's fault and Joker dies. I can explain it like:

Batman drinks the cure and saved himself from poison but little part of The Joker's blood still inside him.

In animes, movie series,(Example: Deceased Batman Begins character Ra's Al Ghul appears in The Dark Knight Rises as a hallucination.) TV series and books, you can see a deceased character appears front of the his/her killer as a hallucination and making remember killer's memories and his fears and kills him/her from the brain and makes him/her have trauma.

Joker can be Batman's fear because he appears several seconds after Batman breathed in Fear Gas. But it is impossible to be same dead man. Batman can't be the %100 same Joker but he can act like Joker because... Because i will explain it on fourth article.

Why Batman doesn't do something to the Joker until the last cutscenes? Because he doesn't want to be controlled by his fears. I mean Joker tries to make Batman kill or let die someone. And Joker tries to make Batman remember his old dead relationship members and make something for them (Batman gets cure to Ra's for Talia).

Those are my ideas.