Kassadin
Kassadin has been somewhat neglected by Riot, since his massive ult nerf last year, and his subsequent rebuffing shortly after. All champions have their strengths and weaknesses, but Kassadin's strengths aren't enough to make up for his weaknesses. For example he can chase down many champions (But only after level 11), and trade with many AP mid laners (But basically no other champions than these). At the core of these issues lies his damage. What's good is an assassin who can't even duel an ADC or squishy DPS? He has exceptionally poor burst, and even though he can follow a champion to the ends of the earth, they often end up escaping or turning around on even a very fed Kassadin, and killing him. IMO, he should receive buffs on the AP scaling to his ult damage, to give a fed or late game Kassadin a chance to kill an enemy when he chooses to commit to a fight.
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