Genral "Needs to be fixed" things. (tip of the iceberg)
Vaynes passive
this is insane, there is no getting away from her, unless you have some sort of dash or escape with long range, even Ezreal cant do much with the short range of his E. when she first came out it was twice as strong if not more than what it is now, whenever she ults, there is no running even if you have fully upgraded boots and she has none. for champs who rely on a slow or something to get away like varus in lane there is no getting away. Her Q gives her enough mobility and chase potential, if she wants stronger chase, why not force her to buy
? this keeps her chase, but fixes the problem of her not needing boots till midgame to catch champs who have do buy them. What i am suggesting is a rework for her passive in some way. maybe have her gained increased attack speed for each champ who is facing away from her by a small amount?. this would require her to be attacking a champion instead of just walking toward them and being able to chase them all the way up their lane.
Evelynn
Just ... everything, shes been reworked, nerfed, shat all over. and where is she? nowhere. when was the last time eve was EVER played? i tried jungling her. i could barely take red (with a leash on minigolems from toplane) and i had to recall afterward this leaves no potential for ganks, no good clear nothing. Her passive only makes it so she isnt seen by wards, and yaknow what that would be a MUCH BETTER PASSIVE, WAY COOLER. the range on it is MASSIVE, its practically the sight range of most champions anyways and if she doesnt wanna be seen by wards she cant use her W which is her only mobility as it breaks her stealth. she is NOT a jungler. she doest have the range or burst damage to deal with mid. i tried her toplane, i got ate by riven. what is she supposed to be? an ADC, a support? i dont know and i dont really think anyone at riot does either. speaking of riven...
Riven
Riven is one of those champions who is just ... ugggh. too strong, i know riot doesnt care about the people like me in silver 5 or whatever, and i dont really blame them, they dont make them the big bucks. but riven in low tier play isnt fun. she is not fun to play against, because she shits all over anyone besides like garen top. i dont want to have to sit on tower with my hands on my knees waiting for minions to get there so i can farm because if i even go close to her i will just explode, no matter what i do.
I will probably add more to this later, but these three are what i could think off from the top of my head, if anyone has anything else they'd like to contribute, id love to hear your thoughts on one of my favorite games current points of balance.