Balance issues
Soraka-needs a buff right now she's a strong support but really lousy when it comes to mid due to the fact she no longer can heal herself, increased her range on q and add more damage to it should help balance her out.
Gangplank-needs a buff right now he's getting slaughtered by any one one vs one not sure if he even counters anyone anymore, with the massive cc on most champions it's hard for him to ever get a foothold on anyone, lower the cooldown on W so he could use it more often lower the mana cost and make parley fire at the same rate as a regular melee attack so it's more even to be able to hit his barrel should help balance him out.
Teemo-needs a nerf right now his blind shot just does way too much damage for it's cc effect it's very op and he pretty much dominates top lane, but is useless most of the time at bot lane even though he is an adc, way to balance make his blind shot scale off attack damage rather than ability power.
Annie-she's pretty balance when it comes to mid, but she is not a support but people use her as such more often simply because she wrecks bot with little to no effort, so either riot do a rework on her to make her more of a support, or simply lower how much damage she does so that people don't want to use her as a support anymore.
Cassiopeia-needs nerf, does way too much damage just way too much nerf her damage that is all.
Heimerdinger-needs a nerf, make it so at least his turrets can no longer heal themselves I mean that's just wrong and make it so his turrets don't do as much damage but increase the damage his actual kit could do.
Malzahar-needs a nerf, take away his dot damage that he does, like really wow one hit takes away half your damn health what's up with that, very op ntm his ult does way too much damage plus a cc effect suppression doesn't seem right.
Shaco-needs a nerf, come on you should never be able to disappear when you are being attacked plain and simple.
Tahm Kench-needs a nerf, it really sucks that he could pick you up and carry you to his tower, how to balance lower the duration of his ability to do that ability.
Tristana-needs a nerf, lower the range she's able to use with her rocket jump and take away the fact that she's able to use it as much she shouldn't be able to use it aggressively then defensively afterwards, very op.
Zilean-needs a nerf, does way too much damage with his bombs just isn't right make it more of a skillshot to lock it on a champion rather than aoe affect would be a good way to balance him out.
Riot take away true damage from all champions that in iteself is op replace true damage with dot damage instead that way at least you could build some type of resistance against it.