Oswald is a twenty-four- to twenty-six-year-old half African American half Italian human. He is very brave and will do anything to help his friends. He is usually the hero, and is usually a plumber eccentric inventor and scientist He loves his brother's Luigi and Mario very much.

Mario is a twenty-four to twenty-five year old Italian human. He is usually the hero of the game, and is usually a plumber. He is very brave and will do anything to help his friends. He loves his brother's Luigi and Oswald very much.

Luigi is the taller but less confident brother who accompanies Mario and Oswald on adventures. Luigi is portrayed as timid, He is usually the hero of the game, and is usually a plumber. Luigi can be heroic and overcome these setbacks He is very brave and will do anything to help his friends.He loves his brother's Mario and Oswald very much.

Wario is greedy and cunning. Wario is often depicted as an adventurer and thief, and there have been many hints towards his other jobs and hobbies.

Waluigi specializing in cheating and mischief. He currently competes to prove he is a main character, not just an extra.