T and I were talking about that... our votes are Lucy Lawless for Poison Ivy, or possibly Hudson Lake, who used to play Callisto on Xena. They both have that crazy, yet calculating edge.

For Harley? Nikki Aycox. With her crazy eyes. Though they'd probably want upper tier, in which case Sarah Michelle Gellar's crazy frail bony-ness may be a good attribute.

I (heart) Ivy/Harley. Harley deserved so much better than Mr. J. And yeah, I too tend to forget that she's not 'canon'.

Will Christian take a DEAD Robin? Would that help? (Though I hear he's back now in comics canon.)