Rules to use the characters: Israel must be in the form of cube. Kazakhstan must be in the form of the flag (brick) self. Nepal must be in the form of the flag (rawr) self. Singapore must be in the form of triangle. Poland's flag must be in inverted self. Or maybe use Poland's normal flag if you want. Chad's eyes must be in the 8-ball form. Syria has a flag change, use Syria with green at the top and 3 red stars at the middle. Or maybe use Syria's old flag if you want. Use the variants of Panama, Chile, Slovakia and Serbia if you want.
Credit to @MatematixScratch for the countryballs.