Oh boy, the Misa-claws! I know what to do! You can choose one of two methods: paperclay or Wonderflex. I myself would go with Wonderflex, since once you have a heat gun and Bondo (or vinyl spackling) anything is possible! What you would want to do with the paperclay method would be to make the claws out of clay, let them dry, and then sand them, coat them in a couple things of gesso or something, then paint them. Too much trouble, if you ask me. The Wonderflex method would be to shape the claws out of the Wonderflex, coat them in a coat of Bondo or vinyl spackling, and then sand that down and paint. The Wonderflex method, in my opinion, is much faster and much easier. With the size of those claws, you wouldn't need much more than a small, maybe medium sheet of the stuff.
www.cosplaysupplies.com <== that's where I get my Wonderflex.