Annie Passive
When an Annie casts spells and gains her passive, It's up FOREVER (until she casts a spell). This one factor is what allows so many Annies to pressure/zone their midlane opponent while winning every trade that they instigate. There's a reason that she's played at every elo, her skill floor is just too low for the amount of power that she possesses. She is a caster with a Point+Click CC that CANNOT miss, and at a certain point in the game, that click means death to a target that gets caught out.
My Ideas for a potential answer for this is to make her passive have a timer, similar to how Yi passive works, but the stacks that she has don't dissipate until the actual stunning stack, meaning that annie wont be a mind-meltingly easy champion. Also making Q a skillshot would help.