Tank Girl Mary Jane (During the Maximum Carnage storyline). Eddie Brock The Penguin (Obvious Choice) Asuma from Naruto Yuko Ichihara Happosai Sylia Stingray Integra Hellsing Roger Mellie Doctor Octopus
It's really frustrating to be Batman. I can ensure it is. Knowing well, he cannot kill villains, no matter how easy and the Joker is definitely 'THE ONE' person that Batman really wants to kill but cannot.
Mr. J has caused more pain and angst to him and his family then any of Gotham's bad boys and girls.
But Joker will still live unless there is a strategic storyline to back his death OR when the Gotham Justice system decides to send him to Death Row instead of his little playhouse in Arkham.