Alright if you are reading than you must wan to know what i think of Riven
and how also to play her so let's begin. I think Riven
is a pretty good contender for the top solo because she is such a mobile champion but she also can get tanky and offensive at the same time while having good CC which is really all the key points of your teams anti carry. In her early game play you can either sit at you turret and last hit or jump in to the creeps with Broken Wings
with the first and second activation Ki Burst
and then use your 3rd activation and Valor
to jump out. It really all depends on your enemy laners. You will mostly farm early and mid game shes a pretty good roamer if you can get someone to hold your lane since she has a stun and shes fast it's whatever you are comfortable doing. Just make sure you get your Creep Score high. It really is the key to winning games with any champ. If your cs is in the bottom half of everyone playing you are not farming enough. This is the whole reason behind getting a solo lane.
Come late game your role changes from farming to focusing their carries (AD or AP it doesn't matter just make sure you shut them down) If you kill their carry or stall them you have done your job and your team should be grateful. Keep in mind to proc your Youmuu's Ghostblade
and Randuin's Omen
early for maximum effectiveness. If you do all of that your team should find winning a bit easier than trying to get rid of their carries through their tanks.