 The writers considered introducing about six personality cores stored in portable spheres , whose main function would be story advancement . They planned cores based on Morgan Freeman 's character Red from The Shawshank Redemption and Quint from Jaws , among others . Ultimately they decided to concentrate on a single core , Wheatley , recycling two of the rejected cores in the final boss fight . Karen Prell led the animation team for Wheatley and the other personality cores . 
