This is not a QQ thread, I'm legit asking for tips. Her engage goes through minions. How do I farm? How do I keep the lane bush permawarded? She's not the champion I personally have the most problems with, but if my lane buddy is getting killed every time he comes to lane I don't know what to tell him or do.
Alrighty everyone, thank you so much for your precious advice, although it won't be the easiest to execute, but now at least I know what I should try to do :D
She's weak to ganks Don't mindlessly ward a bush you know she's sitting in or she'll clear it If your support blind picks something squishy that she's strong against then, as Kenny said, letting them push into you is an option since she can't all in near towers early. Freeze near your tower If your support is feeding, ask for ganks and pray
She's not a versatile champ. Pre-6, all she has is her E and flash-Q. It's on you guys to either react or be aggressive while avoiding getting caught. If you know she's going to E to get to you, try to dodge it and when you do, punish her for missing
Suffer eternally 
On a serious note Bitchana Morgana makes it impossible to do anything but that's a given since she has that bs ass shield
Thresh is a good pick because a good thresh can flay before she connects with her EQ combo
Alistar can knock her back the second she tried to engage and cc the enemy adc long enough to the point they can't apply leona's passive
Soraka works ok but it's usually when you have like a vayne adc who can just farm all laning phase and survive easy because Raka's AoE instant silence (balanced) can stop her from doing her combo and you can just heal up any damage your adc took
oh yeah almost forgot 
is broken as a hard counter to leona
I personally like to play 
into Leona, keep the bush that she'll end up camping in warded and insta-Q her every time she goes for an E. Once you hit 6 there's nothing she can do unless she lands a double ult on you and your carry.
go tank runes and masteries
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How does one survive Leona?
Gems.
Hello :) I am a Leona main and I hope I can help you with this.
I read that you only play squishy supports; that's fine. You can actually beat a Leona with a squishy like Sona, Soraka, Morgana and Janna. You just need to pick your perfect time to poke.
When you see her use her W (where she glows up) that's usually when they are about to E in - make sure you stay away from her until then. There is about a 8-11 second cool down till she can E again so use this time to poke her down. Leona cannot take constant poke in the laning phrase, she isn't tanky enough.
If a Leona takes ignite (which 8/10 times I do) you must be extremely careful cause the moment she gets her hand on a squishy support/ADC it's goodbye. Just watch how she plays and when she uses her abilities so you know when you can poke/go in.
As an ADC playing against a Leona, positioning is the most important thing. See her going in? Then move back. It's better to miss 1 or 2 CS than potientally die.
Also remember that her E will take her to the last person that it hits, so even if your support is in front of you she will go directly to you instead of the support. Be careful of this. It might be nice to take Cleanse as well if you know you will be facing a Leona as an ADC, but save it for her ult. sometimes Leonas will ult first and then W - E - Q.
I think that's all ... If you would like to learn more or maybe practice against a Leona you can add me in game. ^^ hope I helped.
Pick Janna and kite her ass
best counter to leona is to let the wave push to your turret, play on the far side of minions and play champs that arent going to get bursted down, for instance never play asquishy support in a blind pick. As tanky supports are the meta and you will tend to get engaged on easily
if you are support, the first 3 interrupt Zenith Blade with their knock up/knock backs (Janna and Alistar can completely remove her from their asses), Morgana means Leona jumps straight into a target that she can no longer CC and becomes sad. If Leona lands E, Lulu goes like shield ADC -> W enemy ADC and Q his face (possibly Leona's too) -> resume laning as usual, plus her ult is very strong if someone gets engaged.
if you are ADC go for one with a reliable dash or blink 
saving the escape for her E so either she whiffs it or it connects but she follows up much further than planned (possibly under your tower) and doesn't get her ADC's help to proc Sunlight which is why you are getting shredded.
Generic advices regardless of your role and pick;
Ward the lane bush where she likes to sit, DO NOT WARD IT WHEN SHE IS INSIDE, any decent Leona can AA-Q-AA to insta kill a ward before it stealths
Watch out for her W, many Leona telegraph their engage by pre-casting W before they try to E
Don't bother poking her with W up, try to go for her carry instead
Many Leona players are extremely aggro and as such are quite easy to bait into ganks
If she gets an engage and you have CC or debuffs, they should be used on the carry who's coming to help rather than Leona, once she's E-Q a target there isn't much more she's gonna do, what you don't want is Graves coming in and blowing you up when you're stunned and tagged by Sunlight
An early 
(if you are support) does well against her, if you are struggling against her mid and late game as ADC, consider 
