Mario is the main protagonist of the Super Mario series and the mascot for Nintendo. He was created by Nintendo's Shigeru Miyamoto, and has appeared in over 200 games. Originally, he only appeared in platform games. However, he now also features in sporting games, racing games, and fighting games and others. He is considered by many to be the most famous character in video game history, and is known to many as "The Face of Video Games," having 6 games out of the top 10 on the list of best-selling video games of all time.
Mario has been playable in every Super Smash Bros. game to date. Mario's alter-egos Dr. Mario and Metal Mario followed as well. Mario is usually portrayed as a "main" character alongside Link, Kirby, and Pikachu. He does not need to be unlocked in any Super Smash Bros. installment and is always playable at the start.