Looks like Hetalia + SZS. I can't identify all the Hetalia characters off the top of my head, but I added who I could for now. (Is the one with Hungary supposed to be Austria? That'd make sense, but his hair looks so dark..!)

This is a nice piece, overall. I lol'd at the symbolism the artist snuck into some of the cards. (Harumi's "801" for example.)

Poliwag said:
(Is the one with Hungary supposed to be Austria? That'd make sense, but his hair looks so dark..!)

? His hair is supposed to be dark.

Well, I know. But it seems much darker..? I mean, Even the black-haired SZS cast have hair a lighter color than his here.

Helped you out a bit ^^ Added Poland, Lithuania, Shinatty, the silhouettes of the Italy brothers, and Pochi-kun next to Japan. I think that's everyone...

And, FFFFFYESSS. SZS and Hetalia, two of the most amazing parody-ridden anime in existence, in one pic. I want to have the artist's babies.

Ahhh, so it was Poland and Lithuania. I had a feeling it had to be, but wasn't sure enough to tag it. Hahaha, I hadn't even spotted the Italy brothers back there. It looks like right above them are silhouettes of Korea (I spy the emoti-ahoge) and ... Hong Kong, maybe?

I like this artist's style. It's simple, but packs a lot into it.

I can see England in the right side (dressed like an angel). But I don't know how to tag it or note it.

And yes, I think the one up on the right is Hong kong.

Canada's so involved...