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A CPU stands for Central Processing Unit. In the Wii/Wii U/Nintendo Switch era, CPUs take control of Miis and are therefore not controlled by the player. They either compete against the player or are spectators.

Wii Sports
In Wii Sports, 60 pre-made CPU Miis can be the player(s)’s opponents: 30 males and 30 females. They appear as opponents in Tennis, Baseball, and Boxing, though most females will not appear in Boxing, and in Baseball they can be controlled by the player if they are on the same team (only if the player does not have enough Miis in their console). In Bowling, they can appear if the player(s) doesn’t/d't have enough Miis in their Mii Plaza or Mii Parade, where they compete against them or bowl in separate lanes.

Wii Sports Resort
In Wii Sports Resort, in addition to the 60 CPU Miis from Wii Sports, there are 40 new CPU Miis, 20 males, and 20 females, making a total of 100 CPU Miis that can be the player(s)’s opponents.

The player(s) can play against them in Swordplay, Table Tennis Match, Basketball Pickup Game, and Cycling, with them appearing again in Bowling, alongside the player(s)’s Miis, with the same rules applying if the player(s) doesn’t/ don’t have enough Miis. They will be spectators in all sports.

Some Miis that aren't CPUs include player-made and preview Miis, which are used in the aonstration of most of the 12 games. An example of this is Jen in the photos of the Wakeboarding tutorial.

Wii Sports Club
In Wii Sports Club, 111 new CPU Miis replace the CPU Miis from Wii Sports Resort.

Some of these Miis only appear as spectators in Tennis, as teammates in Baseball, and as coaches in Boxing. They also don’t compete in other sports.

Wii Party
In Wii Party, the 100 CPU Miis from Wii Sports Resort return as CPUs and spectators.

Wii Party U
In Wii Party U, the 111 CPU Miis from Wii Sports Club return as CPUs and spectators. Unlike Wii Party, when the crowd shows cheering or unhappy, the Miis shown are all CPUs except for the user's Miis.

Miitopia
The 3DS version of Miitopia will auto-assign the townspeople's roles (including Traveler's Hub) with the Wii Sports Club Miis if Spotpass is turned off. The Switch version still keeps Wii Sports Club Miis to auto-assign some travelers in Traveler's Hub if auto-assigning Popular Miis is disabled in Mii Characters and if there are fewer or no Miis that haven't been assigned to a teammate or NPC yet.

Wii Fit and Wii Fit Plus
In Basic Run of Wii Fit and Wii Fit Plus, the 60 Wii Sports CPUs will appear as the guide of the player. In the former game, Saburo does not appear, thus it is replaced by a duplicate of Hiroshi. This is due to the fact that Saburo's data file is missing, with his internal ID, 000, being taken up by a duplicate of Hiroshi, who is 001. However, he does appear in the latter game and in Wii Fit U.

Wii Fit U
Wii Sports CPUs come back in Wii Fit U in Basic Run, while Wii U-era CPU Miis appear in the menu and the credits for Wii Fit U.

Wii Music
Almost all of the 60 CPUs of Wii Sports are seen in the artworks, except for Daisuke, Akira, Tatsuaki, Shouta, Ren, Ai, Jake, Nick, Theo, Emily, Jackie, Jessie, Maria, Naomi, Helen, Kathrin, Silke, Emma, Julie, and Lucía. However, they all have an internal ID.

Wii Play and Wii Play: Motion

 * If the player doesn't have enough Miis in their Mii Plaza, the CPU Miis will become spectators in many games in Wii Play and Wii Play: Motion. In the later game, they will be able to help them in Spooky Search and Veggie Guardin'.

All CPU Miis from Wii Party
From easiest to hardest:


 * Beginner: Haru, Saburo, Miyu, Jessie, Nelly, Andy, James, Patrick, Abby, Tatsuaki, Julie, Chika, Tommy, Mia, Sarah, Alex, Shohei, Mike, Miguel, and Gwen.
 * Standard: Nick, Abe, Ashley, Megan, Chris, Helen, Hiroshi, Maria, Ai, Shouta, Siobhán, Tomoko, Luca, Ian, Sota, Barbara, Steve, Vincenzo, Yoshi, and Anna.
 * Advanced: Ryan, Takashi, Marco, Hiromi, Cole, Emily, Michael, Naomi, Elisa, Oscar, Misaki, Holly, Fumiko, Ren, Kathrin, Ursula, Giovanna, Gabriele, Fritz, and Daisuke.
 * Expert: Rin, Jake, Greg, Keiko, David, Shinta, Rachel, Hayley, Midori, Sandra, Theo, Gabi, Silke, Rainer, Kentaro, Martin, Eduardo, Susana, Shinnosuke, and Eva.
 * Master: Lucía, Matt, Akira, Pablo, Tyrone, Víctor, Eddy, Hiromasa, Sakura, Stéphanie, Pierre, George, Yoko, Marisa, Asami, Emma, Steph, Jackie, Takumi, and Alisha.

All CPU Miis from Wii Party U
Note that all Miis who only compete as Baseball teammates are marked with an asterisk (*).


 * Beginner: Adrien, Alphonse*, Anna*, Bernardo, Bruce*, Chris, David, Donna, Elena, Enrique, Gerald, Haruka*, Hee-joon, Ivo*, Ji-hoon*, Kentaro*, Mitsu, Pian-Pian*, Pit, Rui, Xiaojian, Xue-Ren, and Yunyun*.


 * Standard: Bernd*, Bowen, Carlo, Delilah*, Dylan, Guillermo*, Jin-ah, José*, Joseph*, Juliette*, Kazuhiko*, Maria, Mark, Millie*, Pedro, Rui-Lin*, Se-young, Sho*, Shu-Hui*, Victor*, Xiuping*, and Yuriko*.


 * Advanced: Alice, Anne, Cheng-Han*, Cristina, Erick*, Frank, Haixiang*, Hiromi*, Ilka, Irina, Jialan*, João*, Kaori, Laura, Marius*, Masako*, Massimo, Merrick, Mi-sun*, Patricia, Ricardo, and Xiao-Tong.


 * Expert: Akira, André, Claudia, Dunbar, Eduardo, Giulia, Hyun-woo, Jesús, Leonel*, Léonie, Marie, Marit, Matt, Mizuho, Mónica*, Paula*, Pavel, Skip*, Sophia, Steven*, Xixi, and Zi-Kai.


 * Master: Araceli, Barbara (or Elena in Wii Party U), Barry, Bo-Jia*, Clara, Daisuke*, Faustine*, Jeff, Jianjun, Joana, John, Joost, Maximilian, Na-rae, Olga, Polly, Rie, Sara*, Susie, William*, Yuehua*, and Yuya*.

Trivia

 * CPUs from the Wii appear to have been saved in the system's internal memory but are hidden from the user's system.
 * Unlike Wii U CPUs, the CPU Miis from the Wii no longer appear in any other games other than Nintendogs + Cats, Super Smash Bros. for the Wii U, along with Super Smash Bros. Ultimate where they appear in the background.
 * For their appearances in Super Smash Bros. for the Wii U and Super Smash Bros. Ultimate, the Wii CPU Miis no longer function as the CPU Miis formerly as they can no longer be interchanged with the Miis saved to the user's the system since they are now premade assets made for the stages they appear on.
 * CPUs are also promotional Miis, appearing in other games, artwork, and promotional images.
 * Miis from Wii Sports Club are seen in some promos and advertisements for games where Miis can be used, such as Mario Kart 8 or Super Smash Bros. for Wii U.
 * The Miis' internal ID sorting organizes the Difficulty Ranking in Wii Party. Starting from Saburo (000) up to Marisa (099), the pattern follows Beginner, Standard, Advanced, Expert, Master, and after reaching Master, it loops back to Beginner. It repeats 20 times until all 100 Miis are ordered in that way. The Internal IDs also follow nationality (Saburo, Hiroshi, and all the other Japanese Miis have consecutive Internal IDs).
 * None of the Wii Sports Club Miis have a mole, freckles, or a cube-shaped head.
 * Age groups, including Child, Young, Middle, and Old, are only used for the Wii U CPUs, and they can be found in the Miitopia data files. No game that Wii CPUs appear in shows their age group.
 * Wii CPUs don't appear in Mario Kart Wii as ghosts. However, Wii U CPUs appear in Mario Kart 8 and Mario Kart 8 Deluxe as ghosts. Wii U CPUs will also be faced off against in the mobile game Mario Kart Tour as racing opponents in offline mode if the game doesn't have enough bots with online players' data to be faced off against. They also appear at the lower place in rankings. Starting from the Mii Tour, they appear wearing Racing Suits, but with offline mode, they often have different Miis for the Racing Suits.
 * In Nintendo Switch Sports, the Sportsmates that replace CPU Miis have the same name as the Wii Sports Resort/Wii Party CPUs, despite Mii's creation being available however in-game.