The ONLY Two females that I feel they're original are Anivia and Annie, those two kickasses... and they're boobless! (except Annie, when she grows up, that is XD)
Everyone loves boobs, that's not a lie, it sells, thinking like Riot, whatever sells is pretty much their priority, I won't blame them for that, but Original Characters, hmmm,
There's Leona, she's fully armored and clothed, sure she has breast shaped chestarmor but that's not revealing, and her Classic skin is Muuuuch prettier than her other skins, it's so colorful, so well made armor, so... different.. than other girls...
I guess it's the idea of her being tank AND no boob revealing... just Two suns that you should not look at them for too long haha XD