Super Mario debuted in 1981 as a carpenter going by the name of jumpan in Donkey Kong, then in 1983 Luigi was introduced and their creator Shigeru Miyamoto depicted them as plumbers.
Mario has never actually been seen doing any plumbing, but apparently was given the job because he spent a lot of time underground. His creators have said that once it was decided he worked as a plumber, many of the other parts of his character β including the fact that he is Italian, and lives in something like New York β followed.
Then in 2017 according to Nintendoβs Japanese website, Mario was stripped of his occupational title of a plumber and was dubbed a βgigβ worker due to the fact that he was many things throughout the years, a doctor, a painter, tennis player, etc..
However, in 2018, Nintendo confirmed our beloved video game character is once again a plumber. So is Luigi, Wa Luigi, and Wario.
βWe wanted him to be someone who might live near you, and not a superhero.β Miyamoto said. So there you have it folks. Mario and Luigi are plumbers by profession !!