I like Mr. Freeze, especially the whole Nora angle. I also just like the look and general idea.
Also, I like Hush because he is so flawed and petty and pathetic... its almost realistic in a way... not everyone needs a good reason, some people are just petty jerks.

I don't much care for Ivy if she's just used as sexploitation, but the whole eco-warrior thing is good. It depends on the writer.

I really don't like Mad Hatter or Ventriloquist, or Catwoman... but that's mostly coincidence in that the order in which I bought comics randomly led me to have huge overexposure to them in a small amount of time. Seeing the same five jokes over and over again became really annoying in such a short space of time.