Aside from this utterly idiotic reason for disregarding Vayne as a laning partner, I am put off by your decision to rush Sightstone (especially getting Ruby Sightstone so early on). You also have very little detail put into your item selection.

Otherwise, your guide is overall good and nicely formatted, but that doesn't make up for the complete lack of effort put into your item choice and path. Not worth an upvote.

Nice

nice one

i've been gone for holiday. will update soonish.

now, individual responses.

koksei: i dont see how build is weird. locket is BEAST right now, shurelya's is for init, and the ice fist is really strong after you get cooldown. plus you HAVE to autoattack after using Q and you autoattack after using E too. zeke's is really not as good anymore. if you are initiating, your ADC wont be in range to receive the aura. shard not even worth mentioning. shadow is the OP one between the 2 pick upgrades.

meiyjhe: thx for upvote! :)

lagger: wtf are you 2 elo? vayne/leona doesn't mesh well at all. o0; vayne can't clear waves to save her life unless she goes lightning knife... leona will jump into enemy and get owned by minion dmg.

Sona vs Leona is very much a skill matchup. Sona is strongest at level 1 where Leona is weakest, after which Zenith Blade outranges Hymn of Valor, but a good Sona can still win either by letting her AD carry wear them down bit by bit, or catching Leona's AD carry out of position.

I strongly disagree with Vayne being a bad partner to Leona though - enough people share my opinion that I'm going to go ahead and call it a mistake in your guide. Even though Vayne has short range and her stun is unreliable, she is one of the very few AD carries who packs hard CC, and she does have Tumble to help her placement. Landing a successful chain stun is pretty much a guaranteed kill.

Looks good, well done

I came here since you made this ******ed blog but that aside the guide seems pretty solid.

"LVL 2: E1. Now you can do your blink and stun combo." - don't refer her E as a blink, a blink would be instantly and not stoppable while you can stop her mid air (I saw you wrote that at e.g. janna)

besides that.. the build is rather weird and you don't even mention Zeke's - I hope you just forgot it.

You also forgot tristana as a good lane partner.

And sona as "bad against" is kinda meh, you write so tho, so maybe instead of categorizing them overall give every champ something.
The weakness of sona is that she's squishy as hell, while leona is run with "bursty" adc's which is perfect to shut sona down. - I guess you know that and you kinda wrote so but make that clear to the reader.

You also don't mention shard of true ice, while Leona does not benefit greatly from the AP it grants her peel, not saying it's core but at least mention it.

Now regarding your blog - sightstone:

Sometimes you'll have games where you won't even want it.
E.g. if you play against double assasin (eve + shaco) you'll spent all/most of your gold on pinks to avoid being ganked + taking away their vision, an oracle doesn't quite work against those, so don't try to say so go oracle.

While I agree that Sightstone is a really good item it's just dumb to say you'll downvote all guides that go gp10 first, sometimes you won't have enough gold for the Sightstone right away, and Philosopher's is 500sth if you start faeriecharm.

Since I started talking about faeriecharm you could mention different itemstarts:
boots, cloth, faerie, flask

Not gonna vote yet waiting for your response first