Pierre is a Mii from the Wii.
Pierre originally appeared as one of the 60 CPU Miis to be included with Wii Sports. Since then, he's appeared in Wii Sports, Wii Sports Resort, Wii Party, Wii Music, Wii Fit, Wii Fit Plus, Wii Fit U, Super Smash Bros. for Wii U, and Super Smash Bros. Ultimate. In most of these games (aside from Smash Bros.), his internal ID is 044, however in Wii Music it is 14. His Mii data filename is cpu_mii_044.rcd in Wii Sports, mii_044.rsd in Wii Sports Resort, Wii Fit, and Wii Fit Plus, mii_044.ffsd in Wii Fit U, and is cpu_mii_db14.rsd in Wii Music. Wii Party combines all 100 Mii data files into one larger file named mii_rsd.bin in the same ordering as Wii Sports Resort.
As with every CPU Mii, he has Mingling turned off. His Mii name in his Mii data file is ピエール. In his Wii U/3DS-format Mii data file, he was originally created on a Wii (1).
His Mii data file contains unused data. His glasses are set to be orange (Wii glasses color row 2 column 2), moved up by 1, and 1 smaller in size. His facial hair color is the same as his hair (Wii facial hair color row 1 column 4), and his mustache is moved up by 1 and 1 larger in size.
In Wii Music, his Mii data file is slightly different. While it's mostly the same as it is in Wii Sports Resort, it now includes a filled out Mii ID and console ID. His Mii ID is 80-4e-83-fe and his console ID is c2-3d-21-af. His Mii ID tells us he was created on August 27, 2006 at 5:19:52 AM.
According to a September 2020 Nintendo leak about CPU Miis, Pierre's nationality is French.
In the files for Wii Sports, his dominant arm for Baseball (Batting) is right-handed, Baseball (Pitching) is right-handed, and Tennis is left-handed. His unused dominant arm for Boxing is right-handed. His Baseball Pitching style is normal. He's ranked 7 in Baseball, 9 in Boxing, and 26 in Tennis. His group IDs are 4, 2, and 0.
In the files for Wii Sports Resort, his Wii country ID is 1, like all CPU Miis. His dominant arm for Table Tennis is left-handed. He's ranked 9 in Swordplay, 8 in Basketball, 58 in Table Tennis, and 6 in Cycling. His unused Canoe and Debug ranks are both 44, matching his ID value of 044.
Pierre appears in promo art for Wii Music playing the clarinet. He also appears as 3D model using the rocket belt from Pilotwings Resort on the Pilotwings stage in the Super Smash Bros. games. For some images, you may have to open them in a new tab to see the whole render.
Names in other languages
Source: Wii Sports Resort