Pixiv title:
LOL七夕104隻英雄的祝福

Google Translate says it's LOL Tanabata 104 heroes blessing so there must be every single Champion released so far in this picture. Tagged all I could see at first.

awww Morgana and Kayle,
And Amumu getting a lovely hug from Anivia.
Love the little touch there being near Anivia that its quite cold.

ZeroMythos said:
Where's Ezreal?

Below the yordle crew
Next to Hecarim, Ahri and Olaf

K
Added the names of everyone.
Not sure 100% if those are the correct skins for vlad and ashe and dont have a single idea whats with Cho having ponytails.
:I

Thanks for all the help tagging, everyone!

I think Zyra has a completely different outfit on though, doesn't look like Wildfire nor her Classic skin.

That's Leona, not Zyra. Look at the little diamond-shaped hair ornaments.

Eye Spy with my little Eyes, Rumble!

GeeTeeEye said:
That's Leona, not Zyra. Look at the little diamond-shaped hair ornaments.

A bit late on this, but the girl hugging Maokai isn't Leona because Leona is kissing Pantheon in the top-center of the image. It's Zyra in a completely different costume, mostly likely.