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 Mirī (ミリー).
 * You can earn her badge for making 50 edit on Wii Party U articles.
 * There's an unnamed Mii in several pieces of artwork for Miiverse that looks similar to Millie. This may possibly be a beta design.
 * Millie appears in promotional material in the Super Smash Bros. series. In Super Smash Bros. for 3DS and Wii U, she is used as the model Mii for the Tails outfit. Millie reprises her role in Super Smash Bros. Ultimate, but is slightly redesigned. In Ultimate, she has a longer face, no eyelashes, and a different nose type.
 * Millie 's reappearance in Super Smash Bros. Ultimate makes her one of the only CPU Miis to appear in person in Nintendo Switch promotional material.
 * Millie is possibly one of the most well known Miis from Wii Sports Club, as she appears in artwork for multiple Wii U games and her supposed beta design became the unofficial mascot of Miiverse, being fan-named London.