My favorite? I have about 14 that I love. And they are: GerIta, FrUk, GiriTurk, Rochu, PruSwiss, HongIce, Cubanada, SeaLat, DenNor, SuFin, Ameripan, Spamano, LietPol, and RomeXGermania.
I do thoroughly enjoy Shizaya. But as 당신 may be able to tell from my 아이콘 I am a 홈스턱 (Solkat is mah otp fo' that fandom) But for 헤타리아 its probably PruAus 또는 Germancest~ owo
I have a LOT of 가장 좋아하는 pairings (being the big shipper that I am x3) so I ship a lot of stuff like RoChu, AmeriPan, FrUK, SuFin, LietPol, DenNor, but the best EVER would have to be GerIta I mean, look at this!