Riven needs some sort of balance.
RIVEN MAINS DO NOT READ. Ask anyone that plays this game, Riven is broken, you hear people complain about it all the time. The only people who will disagree are the Riven mains. I think if you gave her mana she would be a little more close the balanced side. Reason being then she couldn't spam abilities. Let's be honest, she can dive turret and kill someone and then e out. Watch a Boxbox stream sometime and you'll see. No hate on boxbox, he is an incredible player, but just look at her damage output and compare it to anyone else in the game. If not giving her mana, do something that makes her somewhat balanced, that is all I ask.