Illaoi 45% winrate
http://champion.gg/champion/Illaoi http://www.lolking.net/champions
I think that Illaoi has "not so good design": no cc, no engages, no mobility, no disengages, and great bully power in exchange. Her mechanics need to be upgraded - tentacles must be less annoying (no more spawns under enemy tower) and same time they must be more reliable (you found enemies taking drake, but you can't fight them, because you just came and tentacles didn't spawn yet) - player need to have an ability to insta spawn one tentacle or at least choose point where they will spawn themselves (so he'll have some control over spawning). With more control over her own abilities she may get some damage nerfs - unlike Heimer there is no recharges in her tentacles attacks, so if you're going to fight her - you have to tank tentacles attacks from her W, and this makes her annyoing to fight.

or
maybe later on.