Riven's weakness should be an energy source.

Let's face it, you can nerf her stats until the cow's come home. You can nerf her CDR and her auto cancelling. She'll still build 40 percent cool down and always have an edge if you time her abilities just right.

It's simply because her kit is really good. It's too complex to simply be a manaless kit. She has a triple dash knock up combo, an Aoe stun and an AD scaling shield/dash. Her ultimate basically gives her a massive steroid to everything plus an execute.

She needs mana, or at least energy, and I'll tell you why:

If her shield's off cool down, and she didn't waste it like an idiot, she can bait out ignite. Anytime. out of combat, she's not walking like every other champion, she's taking the hyrule express. Wave dashing like she was Link or Alucard in Sotn.

This is the biggest problem I have with her. Her mobility isn't just obnoxious, it looks ridiculous. Why is she swinging at the air? Why is she moving forward so much just by swinging a sword?

If she had an energy source, she'd think twice about using it to cross the river faster. We'd also have a tell on when she'd be vulnerable. Plus all the riven mains could finally look forward to buffs! Everyone wins.

Unless the Riven mains admit that stats<kit spam ability, in which case, they admit that her abilities are broken. ;)