While Mario has long been believed to be Italian thanks to his accent, there's evidence that he's actually Japanese. The question of whether Super Mario is Italian or Japanese stems, of course, from the country where his games are created, as well as the ideas that birthed the character.
Mario is an Italian plumber who resides in the Mushroom Kingdom with his younger twin brother, Luigi. Their adventures generally center on rescuing Princess Peach from the villain Bowser while using power-ups that give them different abilities. Lou Albano (The Super Mario Bros. Super Show!)