Oh, well, there's the canonical interests. And there's Harvey Dent. In the animated series Batman and Harvey were totally intense. (I don't buy Harvey in *this* Nolan-based universe, mind. Not unless he comes back from the dead, which the writer has denied stringently although I think he totally SHOULD.) And I totally believe Batman with Superman, even if I don't want to read it. And besides Two-Face and Catwoman, Batman's relationships with many of the canonical villains are kind of complex. I mean, a lot of them aren't all bad, just like, bizarrely crazy monomaniacal terrorists bent on something or other who might or might not help Batman out at some other time with some common enemy...

...and there's Robin of course. And Alfred. And R'as al Ghul.