It's pretty straightfoward if you read the title.
With the Japanese Client in the works, voices for the Japanese client have come out, and holy crap are some of them legendary. Favourite by far is Shyvana's, though I do love Teemo = Chopper voice and the Shen voice(though partly it's because of the "Shinderu" line). Fav/not so favs, discuss below.
Not sure where the Yasuo, Jinx and Ahri ones are. May be on another channel