I'm Mystique as depicted in the X-Men film series. I can alter the formation of my cells at will, allowing me to look and sound like an exact duplicate of any living being, including height, weight, and built. My control and versatility are so refined, I can even perform partial morphing, such as only duplicate a person's voice, retina pattern or fingerprint to bypass security systems. I can also make myself look exactly like a person who is physically bigger or shorter than I am.