Pac-Man

Pac-Man (originally Puck Man) is a famous video game character who first appeared in the arcade classic Pac-Man.

Pac-Man Vs.
Pac-Man Vs. is the first game in which characters from the Mario series and Pac-Man series both appear. This game is a remake of the original Pac-Man; however, in this version of the game, players control Blinky, Pinky, Inky and Clyde. It seems that during the events of this game, Mario, as the narrator, watches over everything that happens.

Mario Kart Arcade GP
Pac-Man later appears in the Mario series as a playable character in Mario Kart Arcade GP, released in 2006. Here, Pac-Man is an all-around type character who shares a rivalry with Mario. His special items are Pooka, Rally X, and Galaga.

Mario Kart Arcade GP 2
In 2007's Mario Kart Arcade GP 2, Pac-Man returns as a playable character. He retains his appearance from Mario Kart Arcade GP, but this time, his wife Ms. Pac-Man also appears as a playable character. The two games are the only arcade installations of the Mario Kart series.

Trivia

 * In small leaflets celebrating the 20th Anniversary of the Mario series, there are pictures of Box Art from several recent Mario games decorating the edge. Oddly, artwork of the NES Classics version of Pac-Man was also on there (this was the only Non-Mario game featured).
 * Shigeru Miyamoto has often stated that Pac-Man is his favorite game character of all time.