Hiroshi is a Mii from the Wii.
Hiroshi 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, and Wii Fit U. In most of these games, his internal ID is 001, however in Wii Music it is 29. His Mii data filename is cpu_mii_001.rcd in Wii Sports, mii_001.rsd in Wii Sports Resort, Wii Fit, and Wii Fit Plus, mii_001.ffsd in Wii Fit U, and is cpu_mii_db29.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.
He appears twice in the files of Wii Fit, as explained below.
As with every CPU Mii, he has Mingling turned off. His Mii name in his Mii data file is ひろし. In his Wii U/3DS-format Mii data file, he was originally created on a Wii (1).
His Mii data file does not contain any unused data.
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-a5-f8 and his console ID is c2-3d-21-af. His Mii ID tells us he was created on August 27, 2006 at 2:59:44 PM.
According to a September 2020 Nintendo leak about CPU Miis, Hiroshi's nationality is Japanese (Asian).
In the files for Wii Sports, his dominant arm for Baseball (Batting) is right-handed, Baseball (Pitching) is right-handed, and Tennis is right-handed. His unused dominant arm for Boxing is right-handed. His Baseball Pitching style is normal. He's ranked 10 in Baseball, 28 in Boxing, and 59 (the worst) in Tennis (placing him as one of the teammates the player can get if they keep losing the first match). His group IDs are 1, 0, 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 40 in Swordplay, 65 in Basketball, 78 in Table Tennis, and 17 in Cycling. His unused Canoe and Debug ranks are both 1, matching his ID value of 001.
Interestingly, despite Wii Fit containing almost all 60 CPU Miis from Wii Sports, one Mii is absent: Saburo. The reason for his absence is likely a mistake, as he was later re-added to the sequel, Wii Fit Plus.
Saburo's Mii ID is 000 in all games he appears in (with the exception of Wii Music), meaning he is the very first Mii to appear in the files. The second Mii, with a Mii ID of 001, is Hiroshi. Wii Fit does reserve the first 60 Mii data files to the CPU Miis from Wii Sports, however Hiroshi appears twice in the files: once at ID 000 and again at ID 001 where he originally belongs. It is due to this that Saburo's absence from Wii Fit appears to be a mistake.
As mentioned earlier, this was fixed when Wii Fit Plus was released, and Saburo reappears with ID 000.
Hiroshi appears in promo art for Wii Music, using the hand clapping instrument.
Names in other languages
Source: Wii Sports Resort