My ideas for the twins are similar, but opposite, powers revolving around animals. The first twin's power would be that of a chimera: he would absorb traits by touching the animal or a piece of the animal. (Touching a bird to give himself wings, scales from a snake, gills from a fish, claws from a bear... you get it.) The other twin would be to destroy and create. She'd take the solid material around herself, deconstruct it, and then rebuild it into the shape of an animal construct. Basically, she makes a minion out of whatever's nearby. One uses nature to fuel his power, and the other uses unnatural materials to imitate nature. He could kill a snake and then take on its qualities, or she could make a snake out of the rock beneath her feet.

I'll have their full sheets up tomorrow. Sleep takes priority right now.