Ivy in Chains was the first character I ever rolled in CoV. She was a Mind/Energy Dom, and if given the chance I'd re-roll her as Mind/Dark because that's more what her powers were supposed to be, but that wasn't an option when I rolled her. (Power Customization, sure, but Total Focus and Power Burst definitely look like energy attacks, and not the forceful application of shadows, y'know?) But, yeah, I'd re-roll her. She wasn't my first 50, but she was the character I first saw Paragon City and the Rogue Isles through, and she was the character I was playing when the lights out. I loved her concept, I liked the name, she's the reason I fell in love with Doms. I used her as a plot-driving NPC in a Mutants and Masterminds campaign I ran about a year ago, and honestly I felt a little disheartened that my players didn't dig her back story.
But, yeah, I'd bring Ivy back. Slaying Mantis and the Cold-Iron Reaver were fun and all, but Ivy's the character I definitely had the most emotional investment in. She's gotta come first.