Some tips to fight against leblanc
Here are some tips to fight against Leblanc and most player do not applies:
-Flat MR Blue + Health regen per level or flat health regen yellow, this will help your regen after getting harass.
-Health per level runes helps living with 100hp after getting full combo most of the time
-Getting
early game help mitigate her damage aswell as helping you have mana sustain to farm and play the lane safe
-Jungler needs put pressure on Leblanc soo that she will think twice before QW you
Here are some good jungler against Leblanc,

-Never go back to lane without potion
-Build this will help regen health and mana during the laning phase everytime
-Having support dedicating themself as paying attention to Leblanc movement if she tries to kill your ADC

-Pings when Leblanc is missing and ward the river mostly near bottom lane because thats where most Leblanc want to snowball off
-Stay out of Leblanc W range which is 600 range
-Gets some MR boots
to avoid getting in her W range and lower the root duration of her E
-PUSH YOUR LANE OR FREEZE YOUR LANE
-Getting a
will cut her damage in half if you try to all in her
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this is helpful early game vs her because you will outsustain her
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most of Leblanc abilities are single target, this offer health regen which will synergize well with the runes
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depending on your champion any of these items are good to survive Leblanc burst because they give health
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this is a wonderful late game shield vs her
getting this early will help you out harrass her because you will have alot of mr aswell as lowering her mr
this is good early game and can be build into

for AD mid laner this is a very good set up
using this mid combo of Leblanc can really mess her up, giving enough time for your team to back you up or
away
this is a good tool for support if they want to shut Leblanc damage down
support should
leblanc mid combo but require skills to do it
having this late game should be able to put you back in fight
Support should shield and use active item spell to protect their adc or apc
If you follow everything here you should be able to get into the late game. The only time you will die is that the Leblanc is actually GOOD
Here are few champion that does ultra well vs her:
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meh she can`t clear those turret quick enough aswell as she needs to be constantly dodging turret laser
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Xerath Linear stun is perfect to stop her distortion aswell as having high mana sustain and long range farming abilities
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Zed ridiculously strong pokes can keep Leblanc away
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Annie point and click stun can really scares her aswell as having a warning particle around her showing her stun is up. Nobody wants to mess with an annie with a stun up
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since the silence removable lissandra kits completely counters everything that Leblanc does
the new morderkaiser is insanely strong because his shield stay up longer
just build straight up MR + rabadon and beat her up
wait until veigar gets buffed he should have no problem pressing R
farm with Q and punish her by charming her stay out of her W range
she has great zoning tool aswell as plants
a good windwall can cut her combo in half
requires prediction and needs to play safe aswell as having map control at lv 6
poke her with Q and when you are ready to set up a combo just QWER and she is gone
you can outdamage her aswell as having strong basic attack AA,abilities reset
shield,root,farming abilities everything you need vs leblanc she has it
same goes to lux shield root and farming abilities
each time she W just ROOT and combo, nothing she can't do anything to fight backs
and many more
vs leblanc and actually find a way to counter instead of straight up asking for a nerf.
is actually surprisingly good against her (or maybe she was just very very bad), I shut one down in lane quite hard the other day. Just poke by popping a couple AAs and then using Q or E to get off your blight stacks, and after a very short time she can't stay in lane at all. If she tries to all in you, you can ult to root her in place and then just AA away (proccing your W whenever you get three stacks), because your burst with only a Nashor's Tooth is actually very high in the early midgame. Your only job is to not get 100-0ed, which shouldn't happen if you starve her of farm and roaming opportunities, and late game if she starts to catch up, pick up a Zhonya's and maybe a Banshee's veil.