Mizuho

Mizuho is a CPU Mii.

Wii Sports Club
In Tennis, she is a master at ★10. In Boxing she is okay at Level 5.

Wii Party U
In Wii Party U, she is an Expert CPU.

Trivia

 * In Japanese, "Mizuho" means golden ears of rice. Coincidentially, her favorite color is yellow.
 * Her Japanese name is the same as her English name.
 * You earn her badge by leaving a message on someone else's talk page.
 * She appears in My Nintendo promotions
 * She appears in Mario Kart 8 as a ghost. And according to her profile, she's Japanese.