We've got Pulsefire Ezreal, which is an expy of Megaman, so why not have Pulseblade Riven as an expy of Zero?
After all, you could put in this golden joke:
https://www.youtube.com/watch?v=9OVv-J-LXQU
Doesn't that just fit Riven? XD
Oh. My. God. Awesome. At first, I thought the idea was dumb from the title. Then I clicked the link. I don't think Riven is a great champion, especially with her unnecessary early game nerf. So much easier for me to kill and more free kills. >=D but...but...but....but Zero reference!! HOW CAN I RESIST. HOW?!?! Zero is awesome. I'd probably buy that skin without thinking about it and start maining her. It'd be just like playing Zero. However, I'd want her outfit to be black. Black Zero. Must, if happening. Also, her ult would be kind of like the Sigma Blade from Megamax X8. Yes. That. Totally doable. Still though, can't decide if I'd actually want this or not seeing how I don't find her to be a great champion. So I can't really vote because I'm too indecisive about it. =P
You know, maybe some of us don't want Rivens running around. Sure it's nice, but personally I could never deal with riven.
EDIT: just stating my opinion, no need to be angry :)
YAY GREAT IDEA!!!
ALL WILL BOW DOWN TO THE RIVEN 
