Aatrox

"With each foe felled, Aatrox's seemingly living blade drinks in their blood, empowering him and fueling his brutal, elegant campaign of slaughter."(http://leagueoflegends.wikia.com/wiki/Aatrox/Background 20.09.2015).

Remove his revive passive so that his base stats can be improved. And Give him a passive like viktor where he has a specific item just for him. That he can upgrade. This fits in with the lore of him getting stronger with each kill. Another idea is giving him a stackable passive that is capped like cassiobias passive is and giving bonuses at certain number of stacks. Reason for removing his revive is that when you revive you lose all blood well stacks. And in a team fight lets say you played a champ who dint have revive and got aced having aatrox revive would do nothing. You get punished more for having blood well on cd than having it (in terms of getting bonuses you lose more than you gain).

His Q takes a long time to windup is on a rather long cd, lose 10% current hp, it is short ranged, small knock up area and interruptible by every type of cc. Chance idea increasing range, increasing stun duration, increasing aoe radios, making it so that stun effects take place at the end of the ability but stun duration stats at point of contact. (of gorse not every chance should be applied)

His W if riot doesn't like him having that much sustain on it make it so that he gets same amount of heal no matter of how much hp he has. That would mean increasing the heal a little over all (and i mean the heal before the 50% triple heal ), by increasing the ad scaling on it, or increasing the damage on his w blood price and reducing the health taken. (also by increasing the scaling).

His E make it ad damage (increase the ad scaling and reducing the ap scaling ), make the speed faster, (give it passive armor shred same at all level).

His R making better visual effects. Resetting the duration up one getting a kill.