Kassadin Visual Upgrade or Legendary skin. Why?
Some will say Kass looks good already. Yeah, he looks good, it's a valid point. But it's current visual style, stiff movement, stiff attack motions do not make justice to the badassery of Kassadin.
Most people think he's fine because he's got a nice sword which is decent in execution, but could use a lot of work. I know it's not a priority, but he's really desperate to have a stunning new look, he needs it more than it's clear to the observer, for a champion that is incredibly dynamic shouldn't be as stiff animated as he is.