Abby Holland / Abigail Arcane
This is a figure that may have been discussed as a pack in with the DC Swamp Thing figure. Swamp Thing was paired with a sleeveless Batman, of course, but both “Abby” and Batman come with the same backpack accessory… which must be needed to hunt out the Swamp Thing.
While Abigail doesn’t have a costume, she is often wearing red and blue, and always has pure, white hair.