Flagg... that would be heartbreaking. For Ivy. And actually, for a villain, most of her biggest rivalries and problems in the comics were against other villains instead of against Batman. He was just a minor irritant in the end.
Amelia is too darn.... well, it's adorable that she thinks there's a better use at this point.
Poor River. lol
Actually no, Poor Az.
And I already told you my thoughts on Karen. I actually think Ivy would kind of like her. Sort of.