Famicom disk system mascot DISKUN

Diskun was the mascot for the Famicom Disk System in Japan. Diskun appeared on the top left of every Famicom Disk System manual and was yellow just like the Famicom Disk System disks. Nintendo once held a Famicom Grand Prix: F-1 Race contest in which the players with the highest scores would receive a Super Mario Bros. Game & Watch game in a Diskun shaped container.

(source: http://nintendo.wikia.com/wiki/Diskun)