Millie

Millie is a CPU Mii.

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 Miri.
 * You earn her badge by making 50 edit on Wii Party U articles. But On the My Miis wiki, you earn her badge by making 50 edits on articles.