Gankplank really needs...
To have some things shaved off of his kit.
I know it's become a buzzword and most people roll their eyes when they hear it, but gp's kit is overloaded. He has true dmg, heal, cleanse, gold generator, true dmg, spell blade ability, global instant ult, aoe and armor pen/negation with a decent speed boost and slow.
Now hear me out. In most of my Diamond games I am seeing gp top or mid. And I mean almost every game I don't ban him.
The problem with him is that he has a too safe of a laining phase for such a good mid and late game. With an exhaust, w and his barrels it's very unlikely he's going to die solo in lane. Not to mention that his ult is a retarded free assist/kill ability with no cast time and it's global. This alongside his q gold generator is a 0 loss, free stat boost.
He is the only champion with a global instant ult. With no dmg reduction on people hit. For example ez, draven, tf, etc. All have delays and/or dmg reduction on multiple targets hit. Also tf ult range scales with lvl and so should gp's. Give it more dmg, but make it not a global assist ability. Or in the least give it more delay and counterplay.
Another thing I would add is mana cost and decay timers on his barrels. Having a free 60% armor ignore, aoe clear, high burst, cc and gold generator that can crit in one costless ability is too much (OK 2 with q ). Giving it 30-40 mana at rank one would make the gp think more about using his barrels rather than spaming them the whole game with 0 drawbacks. Imagine if teemos shrooms cost no mana, yea no one would want that. Also make the barrels decay, a bit faster on first 2 ranks than the recharge rate. So we don't have them sitting on a barrel next to their casters ready to double or triple connect it.
I'm not saying that he needs big nerfs in numbers. No, he's a late game carry. But at the same time he has such a dominant/safe laining phase and mid game that the hyper carry potential is too much. Yes you can camp him, but then you lose bot and dragon for one champion that still gets gold trough q e and r. I just want him to have to make choices on his gameplay while still being a late game carry.