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Tommy (Switch) originally appeared as an easter egg to replace the Sportsmate CPU with a Mii CPU in version 1.2.0 of Nintendo Switch Sports. His Mii data file can be found in \Mii\MiiCharInfo003.dat.
His Mii name in his Mii data file is トミー ("Tommy"). His Mii ID is as follows: 2D 23 91 E3 C4 00 49 F2 A5 63 D1 B1 01 3A A5 CD
His Mii data file does not contain any unused Mii data.
While the names of the CPU Miis from Wii Sports Resort were also given to the CPU Sportsmates characters in Nintendo Switch Sports, version 1.2.0 of the game added 10 CPU Miis as an easter egg, activated by holding down L + ZL when on the CPU configuration screen. Tommy is one of the CPUs to have gotten a Mii version, however his Mii has been altered since his appearance on the Wii. On the left is a comparison between his Wii appearance and his Switch appearance.
In order for Tommy (Switch) to appear in Nintendo Switch Sports v1.2.0, one must begin a game of tennis, and on the CPU configuration screen (where the player selects the difficulty of the CPU), hold down L + ZL on the left Joy-Con controller. If done successfully, a noise will play, and when the player begins the game, the Sportsmate CPU will be replaced with a Mii CPU using this Mii. The Mii CPU has the in-game title "Legend". As tennis is done with two players on each team, Tommy is paired with Elisa (Switch).
Tommy (Switch) unfortunately does not appear in any promo art.
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USA English: Tommy
USA French: Tommy
USA Spanish: Tommy
USA Portuguese: Tommy
PAL English: Tommy
PAL French: Tommy
PAL German: Tommy
PAL Italian: Tommy
PAL Spanish: Tommy
PAL Dutch: Tommy
PAL Russian: Томми
JPN Japanese: トミー (same as in Mii data file)
KOR Korean: Toby (not to be confused with Toby (Miitopia, Switch))
CHN Chinese: Tommy
TWN Taiwanese: Tommy
Source: Nintendo Switch Sports (v.1.2.0)
Unfortunately, as the Switch no longer supports QR codes, the only way to obtain this Mii yourself directly is via importing them into your Mii Studio with this tool.
This is Tommy (Switch)'s Mii Studio code:
080040030804032e020a030804040c00080400070307000804000a08003b4004000214031306150804000a040705
You can download Tommy's charinfo-format Mii data file here.