Akali needs a nerf. Remove the slow from her AoE, reduce the damage from her jumps to 0. Rest is fine.

Annie needs a nerf. Put the stun on a cooldown on top of needing 4 charges.

Azir I am not sure. Maybe?

Cassiopeia needs a nerf. Later game carry or early game bully, not both. Make her a farmer not a killer early on.

Darius? Maybe not. He is very very strong but he has no real gap closer and reducing the damage in his kit would take away from the character.

Diana needs a nerf. She rarely used DFG when I saw her, and she is meant to be a fighter not a burst-mage. Tweak her so that she will have to stay in a fight more to get a kill.

Evelynn needs a nerf. She is one of those "absolutely no chance you can defend yourself against me" assassins. She isn't too bad, just a small bit overpowered. Small.

Fiora needs a nerf. Frankly giving her a passive AD steroid seems like cheating and betrays her lore. She has enough damage already plus sustain in a 1v1. Oh look, she is a duelist, she really should only be 1v1ing until fed.

Gangplank needs a nerf. Maybe slightly out of spite here, but really his Q should not crit.

Gnar needs a gnerf. The movespeed AND the chunky burst damage from his E3H Hyper skill is annoying, plus he gets most of his health back from his safety mechanic in his passive.

Jarvan IV needs a nerf. I love him, but I agree, the passive is brutal plus the armor reduction from Q. His isn't so bulky that he HAS to be a tank, so the remove of passive armor from his standard is a good start on the PBE.

Jax needs a nerf. But he is a bit like Darius; you can't really take much away from him as the state he is now is how the character is.

Kalista needs a nerf. Reduce the damage and maximum stacks in her Rend. That is all.

Kassadin needs a nerf. Because Katarina can easily be confused with Kassadin.

Katarina needs a nerf. Her playstyle is so blunt when put along side her lore. She needs more movement around a team fight but LESS damage. Now don't QQ, less damage would make her fair, but most Katarina mains will think less damage means no damage. Less nuke, more bouncing about, that'd justify her Group ult on an Assassin.

Leblanc needs a nerf. Early dash damage, plus the damage it gets from early level tagging. That plus the lack of any possible reaction to it due to her being able to retreat to safety with the recast.

Leona needs a nerf. So many stuns. Too many stuns.

Lissandra? I don't really see the problem, sorry. If you burn your gap closer before she roots you then its your own fault. If you let her stack AP on her ultimate then it is your own fault.

Mordekaiser needs a nerf. Tank, or burst mage, not both. Get those reworks on the PBE Riot!

Morgana needs a nerf. Root so ****ing LOOOOOOOOOOOOOOOOOOOOOOOOONG.

Nasus needs a nerf. Reduce amount of stacks he gets per minion. Reduce early wither. He, is, so, annoying.

Nidalee needs a nerf. OH MY GOD! Please Riot, remove the damage amp from the spear and remove the %HME from the ****ing debuff. She can deal horrendous amounts of damage even without the debuff. Skill shots are not hard to land.

Pantheon needs a nerf. Bigger mana costs on the spears. More charges needed for the shield.

Quinn needs a nerf. Ok, I really do hate her. Especially top lane. Nerf her big, I don't care how. Cut a wing off Valor maybe?

Rengar needs a nerf. Way too much early damage, especially from a double Q burst. How the **** is Kha'zix supposed to fight him? THINK OF THE LORE!

Riven needs a nerf. She REALLY needs a nerf. We have been over this so many times. Read the rest of the damn last 5 or so pages of GD, Riot!

Shaco. Annoying, I want him nerfed. Sadly know he can't.

Teemo needs a nerf. C'mon, give the Shrooms a delayed detonation already, it'd make them fair at least.

Tryndamere needs a nerf. Such a ****ing noob-champion. Too much damage, too much sustain and too forgiving with that ultimate. **** sake Riot, what where you thinking with him!?

Vayne. Hate her, sadly she is like Darius; you can't take away from her because it is her mechanics that are annoying and taking away from her would destroy her.

Yasuo needs a nerf. Easy; increase the reduction to Crit damage, don't give him his shield back because the git dived back into a fight with his ultimate and don't give him the armor pen after the ultimate too.

Zed needs a nerf. Put a tether range on his shadows so he cant escape half a map away. Remove the AD steroid passive.

AND done.