 Because the selection of facial features is considered by some to be limited, users are encouraged to develop caricatures of real persons instead of accurate depictions.Nintendo periodically releases special Miis, usually during E3 or to commemorate game and franchise anniversaries.For a limited time between March 13 and March 30, 2007, Wii owners in Japan were sent Mii versions of comedian Sanma Akashiya and tennis player Shuzo Matsuoka.