Mary O.

Mary O, known as Mashiko (ましこ Mashiko) in Japanese and British English texts, is the manual's guide in Super Mario Maker. She is available to be spoken to at any time from the game's menu, by tapping the green manual icon. The game's manual can also be accessed online on the official website. Her role is to assist the player, and share information about the game's content. Her appearance is that of a young female with blue eyes and dark hair, and a headset on. Mary O's name is deliberately a pun of Mario's name.

Trivia

 * If the player taps Mary O's face on the Wii U GamePad in the User Info page, she will appear shocked.
 * A text string in a Costume Mario parameter file suggests that Mary O was planned to be a Costume Mario.