Board Thread:Fun and Games/@comment-1026420-20141202174719/@comment-24152851-20141224110030

Exactly, its proportional to the age and gender. Not always an exact copy. Though Grey Matter Gwen might not be canon, since it was in that What If episode. Also when Azmuth and Vilgax used the Omnitrix, their voices stay the same, while Ben's goes all different.