I think shape shifting would be one of the coolest powers to have. Ideally, I would be like a combination of Clayface and Odo from DS9, where I'm usually human, but I could also turn into other people, animals, or things. I also want to be able to turn into a big blobby monster form like Clayface. Some shape shifters can copy voices and some can't, so I would hope to have that ability. I would probably imitate Shao Kahn and the Halo announcer guy's voices the most.