Quote Originally Posted by glamourama View Post
the Joker - i had written an argument for his ILE-ness (in The Dark Knight, at least) a few years ago here. to me he is the embodiment of impersonal chaos. also, the only person who remains close to him (close as you can get to a psychopath like him, anyway) throughout the years is his dual Harley Quinn (SEI).
See, the problem with your analysis is the Joker's sheer skill at producing Fe. Producing Fe is, indeed, all he ever does, in his own twisted way. He wreaks havok across Gotham to produce a city-wide environment conductive to, for lack of a better word, anarchy. And until the ESI Batman stops him, it looks like he's going to succeed in doing so. "Introduce a little anarchy... rattle the cages." is his motto.

He also seems to value Ni infinitely more than Si. Si-superego certainly fits him, he puts himself in so many risky situations that he really doesn't seem to care for his own health or safety.

Additionally, I think Harley Quinn is an IEI, and actually his mirror rather than his dual. They don't seem to have a very healthy relationship, but they do intellectually inspire each other through her love for him to blow shit up around Gotham and raise all sorts of hell.