Aside from Mickey Mouse, he's one of the most iconic characters of classic Disney animation: Donald Duck, and the easy-to-anger character is celebrated today in an unofficial holiday.
Donald Duck, known his blue hat and shirt and red bow tie, first made his debut in animated short called The Wise Little Hen on June 9th, 1934. Throughout his evolution in animation, Donald became known his outbursts of anger and trademark sounds.
Donald even appeared in several wartime cartoons, such as one that mocked the “Nutzi” regime, Der Fueher's Face.
Despite Mickey being the mascot of Disney, Donald Duck actually appeared in over 40 more theatrical shorts and movies than Mickey. He's also appeared in many video games throughout the years, such as Goin' Quackers and the popular Kingdom Hearts series.
In Europe, Donald Duck was massively popular in comic strips and comic books and many countries continue to publish Donald comics to this day.