Instead of using Master Chief, Microsoft created a character to promote the Xbox 360 in Japan. San Roku Maru (Japanese for 360) is part of the Xbox Mission Division, a group that wheels and deals with video game characters to bring them to the Xbox 360. The Mission Division stars in shorts like this one for the Idolm@ster 2.
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And someone made a San Roku Maru costume just for Comiket 78.