Green Lantern: “You and your sister melded into one hybrid male/female creature? Bad which way, Todd? Bad as in super-duper creepy? Then I’d give that a big fat check in the “yes” column.
Synopsis "Emerald City. A Dark Things Epilogue"
The JLA and JSA have freed Green Lantern (Alan Scott) from possession by the magical Starheart. For years Alan had controlled the small fragment of the Starheart which gave him his Green Lantern powers. Now he finds himself custodian of its entirety. The cost is that his twin children (Obsidian and Jade) must stay fore ever apart. They are the personifications of light and shadow within the Starheart. If they come within a 1/3 of mile of each other the power of the Starheart overwhelms them and fuses them together into a single being. The danger is that this will break Alan’s control of the Starheart and sets free once more.