A CPU (Computer) stands for Central Processing Unit. This Mii isn't controlled by the player. They can play against the user in two-player sports and can also be found the sports crowds.
In Wii Sports, 60 pre-made CPU Miis can be your opponents: 30 males and 30 females. They appear as opponents in Tennis, Baseball, and Boxing. In this last sport, not all female Miis appear. In Bowling, they can appear if you do not have enough Miis in your Mii Plaza or Mii Parade, playing in the other lanes.
In Wii Sports Resort, in addition to the 60 CPU from Wii Sports, there are 40 new CPU Miis, 20 males and 20 females, making a total of 100 CPU Miis that can be your opponents (this creates an equal amount of males and females with 50 of each).
You play against them in Swordplay, Table Tennis - Match, Basketball - Pickup Game, and Cycling. Again, they appear in Bowling, alongside your Miis, regardless of whether you have enough Miis in your Mii Plaza or Mii Parade. They can also appear as spectators in various sports, such as Table Tennis and Basketball.
Some Miis that are not CPUs include those made by the player and preview Miis, which are used in demonstration of most of the 12 games.
In Wii Sports Club, 111 new CPU Miis replace the CPU Miis from Wii Sports Resort, sporting some new facial features exclusive to the Wii U's Mii Maker's updated feature set.
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 do not compete any sports in Wii Sports Club 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 (as Elena), Barry, Bo-Jia*, Clara, Daisuke*, Faustine*, Jeff, Jianjun, Joana, John, Joost, Maximilian, Na-rae, Olga, Polly, Rie, Sara*, Susie, William*, Yuehua*, and Yuya*.
- It seems that CPUs from the Wii appear to have been saved in the system's internal memory, but are hidden from the user's system. It may suggest why they disappear from audiences and other graphics if they have more than 20 made Miis.
- Unlike the current Wii U CPUs, the CPU Miis from the Wii no longer appear in any other games (other than Nintendogs + Cats, SSBWiiU, and SSBU, only as background characters in those games) outside of the Wii series.
- In Baseball, CPU Miis will play on a human player's team if they do not have enough Miis in their Mii Plaza or Mii Parade, but the human player will still control them rather than the computer like they usually are. The player can also use them if the player plays as a guest.
- CPUs are also promotional Miis, appearing in other games, artwork, and promotional images. They are likely assets from a central resource within Nintendo and not explicitly created for Wii Sports.
- CPUs Miis are not impossible to recreate and can be made with reasonable effort and a lot of time. However, the Wii U CPUs are more complex to create than the Wii CPUs since the Wii U has more features than the original Wii Maker.
- Aside from being played against in Wii Party, CPU Miis can also appear as spectators, background characters, and game/minigame elements (for example, a Mii on the Bingo card or a Mii that cheers or boos for a player). However, this largely depends on how many Miis the player has in their Mii Plaza or Parade.
- If the player does not have enough Miis in their Mii Plaza, the CPU Miis will become spectators in games like Cone Zone and Wind Runner in Wii Play: Motion. They will also be able to help them in Spooky Search and Veggie Guardin''. In the Basic Run of Wii Fit and Wii Fit Plus, the 60 Wii Sports CPUs will appear as the guide of the player. They came back in Wii Fit U even if in the menu of said game, Wii Sports Club/Wii Party U CPUs appear.
- 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.
- None of Wii Sports Club Miis have a frown mouth, a mole, freckles, or a square 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.