It's annoying that you're being silent on fiora and problematic AD itemization Riot
I have yet to see anything regarding the biggest problems affecting league.
#1
Her early isn't even objectively weak, she can basically insta-stack fervor between lunge and bladework, and she still scales into an absolute monster that can outduel anything short of a well-stacked nasus or 5-6 item Jax.
#2
While I personally don't think it's a draven issue as opposed to more of an AD itemization issue, he still ought to be looked at for potential love taps IN CONJUNCTION with some of the stuff I'll post below
#3
Ideally this item would become more of an AD caster item and less of an everything physical dmg item (I proposed earlier removing omnivamp and introducing vamp from physical spells with a lower life steal component to favor casters over auto attackers). In any case, this item is relatively easy in terms of fixing since at the very least you can take the middle ground between the OG 15% and the now busted 30% in regards to nerfing it.
#4
This thing has reared its ugly head in a nasty way now that AD defensive itemization is better than ever. 12% dmg reduction to a single target might not have meant much before, but in conjunction with Deaths Dance and GA being almost universal, this thing is amplifying the defense an ADC gets. Unlike DD, this item should probably get a full rework, a shame because it had gone through one relatively recently, but what must be done ought to be done.
#5
Who knows, maybe if points 3 and 4 are addressed, this may not need to be touched, but otherwise it needs to be nerfed if not slightly.
Let's take a look at some issues affecting higher elo and competitive play.
#1
Honestly, in terms of overall power budget I don't think she's too much of an issue. What's incredibly frustrating is that she never has an actual weak point in the game. She has no points of vulnerability, especially with how spammable her Q is. If nothing else, a Q cd nerf will probably put her in line. Something along the lines of 9/8/7/6/5 seconds would probably put her in line without destroying her.
#2
Special double mention for this asshat for being extra broken
#3 Support itemization, particularly for tankier supports. I'm looking more at knight's vow right now since how it interacts with DD and PD is ridiculous.
#4
is incredibly strong right now. I honestly don't know how to fix him, but his versatility as an offensive playmaker and defensive peeler ought to be looked at, he can overshadow many other supports with his versatility.
Her traps once she gets an essence reaver.
Don't forget the unrestricted powerhouses either.