Syren is an original character who only exists on Counter-Earth. She is largely based on Shriek from the main Marvel continuity. She was experimented on by one of the Evolutionary's men and her genes were altered in horrific ways. Despite her menacing looks, she is a positive character who will side with Spider-Man and his team early on. Her main ability is using sonic screams against her enemies, so make sure you have the voice talent to record screams for the part, although if you record about 4 or 5 versions of the scream, that will be enough for variation.