Ren is a Mii from the Wii.
Ren 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 007, however in Wii Music it is 45. His Mii data filename is cpu_mii_007.rcd in Wii Sports, mii_007.rsd in Wii Sports Resort, Wii Fit, and Wii Fit Plus, mii_007.ffsd in Wii Fit U, and is cpu_mii_db45.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 れん. 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 80-4f-94-84 and his console ID is c2-3d-21-af. His Mii ID tells us he was created on August 30, 2006 at 10:50:56 AM.
According to a September 2020 Nintendo leak about CPU Miis, Ren'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 39 in Baseball, 11 in Boxing, and 56 in Tennis (placing him as one of the teammates the player can get if they keep losing the first match). His group IDs are 7, 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 right-handed. He's ranked 50 in Swordplay, 34 in Basketball, 17 in Table Tennis, and 56 in Cycling. His unused Canoe and Debug ranks are both 7, matching his ID value of 007.
Ren unfortunately does not appear in any promo art released.
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This Mii originally appeared on the Wii!
Here's how to recreate them on the Wii:
Names in other languages
USA English: Ren
USA French: Ren
USA Spanish: Ren
PAL English: Ren
PAL French: Ren
PAL German: Ren
PAL Italian: Ren
PAL Spanish: Ren
JPN Japanese: れん (same as in Mii data file)
KOR Korean: 명석 (Myong-suk)
CHN Taiwanese: Ren
Source: Wii Sports Resort