Millie

Millie is a CPU Mii from Wii Sports Club and Wii Party U.

Wii Sports Club
In Boxing and Tennis she is unknown. She is only a Baseball team member.

Wii Party U
In Wii Party U, she is a Standard Mii.

Trivia

 * She is one of the three Miis that appear in the artwork of Mario Chase from Nintendo Land, with the other two being Skip and Alice.
 * Her Japanese name is Mirioka.
 * You can earn her badge for making 50 edit on Wii Party U articles.
 * There's might be a "beta" version of her on several miiverse pictures.
 * Millie is probably one of the most well known miis in Wii sports club because she is often seen in mii or other Nintendo related games or pictures.