What is '2P'/'Second Player'?
As everyone knows, Hetalia is a story about nations and the likes, and through hilarity and it's fair share of racism, wars and history are shown in a fun way to the youth and above of the world.
Well, 2P is still Hetalia only... the personifications are just a little bit... different. Italy is a short-tempered foul-mouthed youth, Germany is a lazy couch-potato, Japan... do not mess with Japan. England is a grinning meglomaniac, America is your typical street gang member, Romano is a grinning metrosexual with a knack for poison and Prada and the list goes on.
What is 'HetaOni'?
HetaOni (Lit. 'Useless Demon') is a game universe where the axis, allies and Prussia find a haunted mansion in the middle of the woods and go inside. Based on 'Ao Oni' (Lit. 'Blue demon'), they have to fight a giant scone-looking monster named 'Steve' (Lit 'The Thing', though fans call him Steve) and survive. The aim is to basically get out alive.
Why are some designs only fan-canon?
Well this is because Himayura(sp?) only technically made the designs for the axis, and Nyotalia designs for the allies, axis and the awesome Prussia. Apart from that, the other 'canon' designs you'll see are fan-made, only they've become very appealing to the in-general fandom so we dubbed them 'fan-canon' designs. A prime example is Beek's 2P!England~