Marco is a Mii from the Wii.
Marco 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 047, however in Wii Music it is 16. His Mii data filename is cpu_mii_047.rcd in Wii Sports, mii_047.rsd in Wii Sports Resort, Wii Fit, and Wii Fit Plus, mii_047.ffsd in Wii Fit U, and is cpu_mii_db16.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 マルコ. 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-8b-67 and his console ID is c2-3d-21-af. His Mii ID tells us he was created on August 27, 2006 at 7:26:20 AM.
According to a September 2020 Nintendo leak about CPU Miis, Marco's nationality is Italian.
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 42 in Baseball, 35 in Boxing, and 39 in Tennis. His group IDs are 7, 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 25 in Swordplay, 56 in Basketball, 96 in Table Tennis, and 63 in Cycling. His unused Canoe and Debug ranks are both 47, matching his ID value of 047.
Marco appears in promo art for Wii Music playing the saxophone.
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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: Marco
USA French: Marco
USA Spanish: Marco
PAL English: Marco
PAL French: Marco
PAL German: Marco
PAL Italian: Marco
PAL Spanish: Marco
JPN Japanese: マルコ (same as in Mii data file)
KOR Korean: 마르코 (Marco)
CHN Taiwanese: Marco
Source: Wii Sports Resort