Aside from being plumbers, what are Nintendo's video game characters Mario and Luigi to each other?

Mario is a fictional character created by Japanese video game designer Shigeru Miyamoto. He is the title character of the 'Mario' video game franchise and the mascot of Japanese video game company Nintendo. Mario has appeared in over 200 video games since his creation.

Depicted as a short, pudgy, Italian plumber who resides in the Mushroom Kingdom, his adventures generally center on rescuing Princess Peach from the Koopa villain Bowser. Mario has access to a variety of power-ups that give him different abilities. Mario's fraternal twin brother is Luigi.

Luigi was originally developed as a palette swap of Mario with a green color scheme instead of red, Luigi has since developed a personality and style of his own. As his role in the Mario series progressed, Luigi evolved into a physically distinct character, and was made taller and thinner than his brother.