Mario

' Mario (Also known as Mario Mario') is a character from the Super Mario Bros.'' series of games, one of Nintendo's most popular franchises. He is also the main mascot of Nintendo and one of it's most recognizable characters alongside Link, Pikachu and Samus among others.

History
In Aki Momohara-chan Steals the Spotlight!, Mario helps Aki Momohara find her way to a new universe that she would be most comfortable in alongside Sonic.

Mario is set to appear in the Multidimensional Dark Masters and Great Demon War Teramix story arcs as a guest star.

Trivia

 * Mario's franchise of origin is in fact the best selling video game series of all time, even more so than Pokémon itself.
 * Outside the story Aki Momohara-chan Steals the Spotlight!, Mario and Sonic have also appeared together throughout both the Mario and Sonic Olympics and Super Smash Bros. (Sonic is a playable character in Smash Bros. Brawl, 3DS/Wii U and Ultimate) series of games.