As a big fan of Kano, I don't want to see grenades or mines. Not needed for the character. Expanding upon his eye laser functionality, which has been lacking in the past 2 games, would be more welcome. Also, branching out further from his MK9 fighting style and fleshing out a knife variation would be so awesome. Basically, less random mines and more eye lasers/cybernetics and knives. I actually did a writeup about Kano here:
http://goo.gl/Um0qot