Aries - Belgian
Taurus - Latvian
Gemini- Tawainese
Cancer - Canadian
Leo - American
Virgo - Japanese
Libra - Italian
Scorpio - Filipino (I know she/he isn't in Hetalia, but Hima said that Philippines is one of the most wanted characters)
Sagittarius - Finnish
Capricorn - Swedish
Aquarius - Scottish
Pisces - Irish