User blog comment:Krauserlols/Is Riven a real Wind Master?/@comment-4124337-20131218155641

Firstly, It's Riven. Her wind slash is a wind technique which is all it has to be, she doesn't need to master anything if it still kills people. Read Rivens lore, then read Yasuos lore and they complement eachother in terms of the timeline and the league.

Secondly, listen to Yasuos voice files, he seems to STRONGLY believe it is Riven as well, given she is on the side of Noxus in the war.

Thirdly, it COULD be Ao Shin, the same way that the Poro's COULD be the real summoners and the same way that Kog Maw COULD be a mutated cat. Without proof who is to say otherwise. If you base anything on evidence that you are given then it's Riven.