Mine is absolutely undoubtedly Russia/Ivan!X3 even though there are other guy characters in Hetalia Axis Powers - Incapacitalia I like as well but Russia is just a win!x3
^ Oh te Don't Get The Picture? well Mr.Ivan is very Sadistic (which means he gets enjoyment for hurting others...or something of that nature) but based on his face one would assume he's harmless! hopefully that cleared it up!^^
I only really started to watch it... but I found Italy pretty funny and Germany is quite an interesting character. Oh and England... he's pretty quirky XD