Main characters:

@Cargo_Brothers - Polandball

@F4XDToT - USAball

@TheMurzik120k - Russiaball

@Malrat_ - UKball

@YumiGaming_ - Franceball

@9191unikitty - Chinaball

gamejolt - UNball

Major, Reccuring and Minor character:

@DaRealMemeCentralLol - Vietnamball

@Regalito - Argentinaball

@Braixen-official - Philippinesball

@YvonXD - Laosball

@sonicfan2 - Iranball

@Sel499 /@Poley64 - Georgiaball

@NonsenseNH - Azerbaijanball

@TaeYai - Armeniaball

@ColRun1613 - Cubaball

@Noob_Gaming - Brazilball

@MemesFunny - Boliviaball

@MinionAppleBanana - Indonesiaball

@Da_Treino - Mexicoball

@SavaOnline - Indiaball

@WS_006_SoraDark - Turkeyball

@AxelTheSonicFan - Malaysiaball

@CringeIdiotBreadFace - Myanmarball

@Silver_Ghost - Japanball

@Boris-The-Wolf-Bear - Hungaryball

@tooyo1234 - New Zealandball

@ice_god - Australiaball

@Kholey69 - Canadaball

@Xvonlol - Belarusball

@DaRealFlexSentralLol - Spainball

@DeafPlayer - Nepalrawr

@Fial_official - Irelandball

@aflacc - Netherlandball

Various GJ users - Other countryballs

Misc:

@ZaulBarraca - ISISball