Costume guide:

America- Captain America

Malaysia- Black Widow

France- Ayame Sohma

England- Professor Dumbledore

China- Boris Airay

Brazil- Alice Liddell

Russia- Zero Kiryu

Georgia- Yuuki Kurosu

Japan- Edward Elric

Uruguay- Winry Rockbell

Germany- Mori-Senpai

Italy- Honey-Senpai

San Marino- Renge Houshakuji

Prussia- His awesome self