I think Blitzcrank is a good candidate for the modernization treatment
AKA the WW style update. Literally modernizes the character that he already is. I think it'd be perfect for him, with the right changes. No gameplay changes needed imo..
EDIT: I guess you're alright perfectly right with how Blitz shouldn't rely solely on his Q to not be useless to his team but it's just the way I like him because I play Mord&Blitz botlane and whenever my Blitz partner lands a hook it's pretty much a free kill or forced summs almost every time. But yes, you ppl are definitely right

) have one ability that they need to hit to win the lane. If they hit sucessfuly on the good target, they are rewarded.